Can you solve the time travel riddle? - Dan Finkel

[@TEDEd]

Get the solution to the bonus riddle here: brilliant.org/TedEdTimeTravel/! Also, the first 833 of you who sign up for a PREMIUM subscription will get 20% off the annual fee. Riddle on, riddlers!

[@victora73]

TED-Ed pls make more riddles

[@yorelyoung6407]

The answer is yes. It will always be 2.

[@RiteshNEVERUNIFORM]

I would take 7 and place it 1 at centre of the 6 nodules.!! Of cource 6 will be the minimum number.

[@MatthewSmith-wx9wy]

TED-Ed is way too hard with their riddles!

[@IvanIvanov-ui9ow]

Check my page for ideas to your next travel destination instagram.com/travellgoal/

[@Gdf353bgy]

*Bold of you to assume that I'm helping this guy out*

[@sometimessnarky1642]

An intern no more! He's playing Jurassic park and your writing your thank you speech for the Nobel prize you are about to receive for time travel technology.

[@tabitha9723]

Anyone who “accidentally” falls through a time portal can’t be trusted

[@itram99]

imagine how rich you'd be if you sell his laboratory

[@neutralpie420]

I want to like this comment but it has 420 likes. Please keep it at 420 likes.

[@scribbler_crowe]

*Well yes, my text IS bold*

[@kroniclenonicle9100]

"You only have one minute to go in the portal" *alright then...lemme spend 3 minutes thinking about it*

[@ErmisSouldatos]

Or you take your time thinking, and, when you figure it out, you make another potal to travel back to when the portal connecting to the professor was open, and then save him

[@MDHUSSAIN-my7rh]

@@ErmisSouldatos Epic🤣

[@gobbyli6118]

Portal: Ok, I can wait for 30 seconds more

[@calmingmom1196]

You just grab all of them and make a bunch of triangles no matter what at least one of them is going to have a pure triangle then you take the rest back in the past so that way it's going to be very simple to get there and back seriously you bring all of them there's a good chance that if you just use three of them for each portal you're going to get one eventually

[@witherbomb47]

Definitely caught in a time warp

[@hafsa7951]

This guy has an amazing voice

[@merc6666]

Ikr its so soothing

[@MichaelAury]

Yea he’s my favorite Ted Ed narrator. He has a very clear pronunciation and his voice has the perfect tone for educating. Not too cold and not too friendly.

[@blankname1]

Check him out, his name is Addison Anderson.

[@hafsa7951]

Dragon Slayer thanks, I will

[@minakshieco1]

IKR

[@joanne3330]

0:14 love how I just casually watch as my boss "accidentally" steps through a time portal

[@marcusscience23]

This is the part where you just throw the 6 chrononodules through the portal for him, and don’t step through yourself.

[@Grapes-nk2vk]

Step one: confirm you have green eyes Step two: ask the nodules to connect correctly so you can leave.

[@AbhishekKumar-uu4uj]

Reference please ?

[@agenti4734]

@@AbhishekKumar-uu4uj it is from one of the older riddles. The riddle consisted of people with green eyes and to escape. They needed to have green eyes but they didn't know they had green eyes

[@AbhishekKumar-uu4uj]

@@agenti4734 thank you

[@rejanesalgueiro2264]

This meme is getting really annoying

[@sudoornator3000]

Step three cover yourself in oil

[@stormysamreen7062]

Me: * grabs six chrono nodules * Me: * opens portal * Me: * gets splinched because there *was* a chance of the portal collapsing, no matter how few you bring * Me: Well, fml.

[@danielcole3508]

Hehe nice... splinched

[@AsifIqbalR]

@Brianna Sloves haha... Potterhead :D

[@danielcole3508]

@Brianna Sloves Me: realizes it would just be easier to just accio the guy through the portal Also me: realizes i don't have wand... cries for the next week

[@danielcole3508]

@Brianna Sloves yes but we can't apparate through it because it's a portal. You have to go through it apparation would be like walking around instantly or only parts of you going through portal.

[@donyasigalesin1087]

Mujahid Syed same

[@Tombee2]

Me: five sounds nice-No 6, 3 for 2 triangles. Ted-ed: the answer is 6 Me: yes big brain time

[@yourtypicalneighborhoodkar9605]

Annnnnd you most likely solved the bonus riddle

[@lsedge7280]

Basically same as me. I was like "50% chance of red or blue for one", 3*2 = 6. Might be six. Big brain gang.

[@ssmmarble9425]

400 like

[@Berilia]

Yeah my thought process was just "if there's a 50% chance of getting one colour and you need three of that one colour, 6 would work" I know that's almost certainly completely wrong, but I got the right answer :D

[@angeliki5135]

Actually, because of the bonus riddle and also needing to get the professor back, you'd need 12. 6 for yourself and 6 for the professor since 1 portal teleports 1 person before it disappears.

[@sahilhussain7328]

How does one ACCIDENTALLY fall through a time vortex?

[@justyouraveragecorgi]

And how does one ACCIDENTALLY add deadly lasers to ants?

[@axelfirekirby]

weird al once accidentally stepped into a alternate dimension

[@PrincessAshley12]

Hot tub time machine

[@theivoryguy2476]

@@justyouraveragecorgi How does one not know what their eye color is?

[@squid_cake]

Sain 7417 I ordered a pizza and got a time vortex instead, what's your point

[@Gameknight2169]

Of course, the hexagon is still the bestagon.

[@epicbots8479]

hexagons are the bestagons baby!! (watched that vid btw)

[@bedrock30_]

Naturally

[@AUserNobodyAskedFor]

I watched that vid

[@maartenvandijk3629]

Bees!

[@meapyboy12345]

righty you are

[@yanagelfand4337]

I went from the opposite and tried to find a way to AVOID same-color triangles. The fact that a hexagon is symmetric made it easier. So I tried different combinations of the two colors on the outline (there are only three). All the times I stumbled across two rays of the same color from the same vertex, I added the third line of the different color (worst case scenario). And all the times it eventually led to a triangle. With a triangle, a rectangle and a pentagon the same strategy led to "winning" (there is a way not to form a triangle), so I increased the quantity of vertexes until I found out that a hexagon doesn't work like that, so it should be the correct answer. The bonus riddle works the same way. I see that this way is less logical and more intuitive, but for me it was easier to actually see how it can play out.

[@chirurdp3454]

Damn bro you are determined

[@GMPStudios]

Now I understand why there were exactly 6 infinity stones

[@carastark9163]

6 is the new 42

[@JrKid-jb3vm]

Perfectly balanced

[@GMPStudios]

@@JrKid-jb3vm but it cost Everything 🙃

[@GalluZ]

Conclusion: Thanos will win against Captain Marvel. lol xd

[@lanceleynes5862]

XD

[@linali6865]

*tells riddle* me: uh 6? *says answer is 6* me: IM SO FREAKING SMART

[@sunfye]

I just said 6 cuz 3x2

[@samf33]

Txc rags same but I did a little more thinking

[@justin4514]

@@sunfye me too

[@francischong5804]

Omg, I am glad I have not wrote this comment yet because it was my first time solving this question successfully and getting correct.

[@mylenefrancisco888]

Lina Li Same

[@capertillar4634]

3:38 Just grab him through, you have long enough arms

[@nightingalelara7519]

Hehe

[@TheFerretofEarth]

Lmao

[@user-qp3bc2up8x]

LMAOOOOO

[@captainkencel1557]

you cant see where he is though

[@thegreatmo5067]

Rofl

[@Tippex_Official]

0:09 if he’s called Ramsey, I assume he rants at his workers Also, here’s the solution: 1. Bring all the nodules, 2. Make tons of 3 node triangles till you get what you want

[@LocalPlagueDoc]

1:04

[@meco7956]

@@LocalPlagueDoc never said they one portal affects others

[@autumnveir1168]

3. Say you have green eyes. 4. Ask the professor to leave. 5. If you have been questioned about his whereabouts, just reply "OZO"

[@zForce4]

Or you could just never get one and stuck in history forever Just like how I never get good teammates when solo Q for anygame

[@Tippex_Official]

@@zForce4 assuming each line has a 50% chance to be red or blue, then there is a 1/4 chance you get a working triangle. If there are, say, 100 nodes in a box, then you would get about 25 working portals. At least that’s the estimate.

[@xiupingliu7343]

Me: Wait so how many nachos does he need?

[@HadesEditsReal]

get a notification. watch the video again. nice comment.

[@ShauryaSingh-ts2oc]

Can't I just throw the box of nodules in the portal so that the professor figures out himself ?

[@aljhungwapo]

Oooorrrrrr maybe the portal is kinda two way? If the portal isnt close yet maybe the professor can just jump back?

[@kudoamv]

The assumption contradicts the solution to the problem, you guys are good. Spotted the loophole.

[@thomashaines3182]

@@kudoamv thanks

[@masonmatt2145]

Keep in mind that the professor could be dead already when you step through, although a slim chance, making your rescue mission pointless, even if you can get through.

[@maximilianopena]

Can't just bring three modules and throw those together until colors match?

[@finris1]

The bonus riddle: there will always be at least 2 triangles with same color sides. Take the possible colors extending from 1 nodule as in video. (1) If there are 5 or 4 blue sides (or 0 or 1 as that is just 5 or 4 red sides with the same result just with opposing colors), then there are at least 2 sets of 3 sides that will result in a portal like in the first riddle. (2) For the case of 2 or 3 blue/red sides, there will be 1 set of 3 sides that will create a portal as in the first riddle, and there will be sides between the nodules that could be either color and not create a portal. Pick a side as either blue or red (which doesn’t matter), and then fill in the remainder to try to prevent a portal. Another portal will always form no matter which initial side you pick.

[@milx7210]

Im not going to read that im just gonna assume you're correct

[@TheBloodsuger150]

Or: Start with the triangle we know forms, let’s say it’s red. We know any ‘out of triangle’ node can’t be connected to the 3 ‘triangle nodes’ with 2 red lines, because that would make a red triangle, so at least 2 of their connections to the triangle are blue. If every out of triangle node has 2 blue connections to the triangle, 2 out of triangle nodes must share at least one vertex of the triangle that they both have a blue connection to. If this is true, out of triangle nodes can’t connect to each other with blue lines, or they’d make a blue triangle with that shared node. But if all out of triangle nodes are connected with red lines, they’d make a red triangle between the three of them. So there is no solution without at least 2 triangles.

[@jatarokemuri4549]

cant we apply the argument in the video to all the points and say that by symmetry, there will always be 2 portals form, and going futher and say that at least 6 portals always form?

[@ryanburkett949]

@@jatarokemuri4549 We can't say 6, cause the triangles formed by some of the points may be ones we already counted as formed from the first point. But we can make sure of at least 2 by using one of the nodules not used in the first 4 and doing a symmetry argument.

[@marcusscience23]

Or we could just throw the 6 chrononodules through the portal (without actually stepping through it) and have the professor connect them himself. Skipped the bonus riddle, only need 1 portal to work.

[@shettysrjan30]

00:15 =professor has fallen into a time hole and i have to go in through the same time hole to save him 03:52= A Given portal can transport ONE PERSON before it closes

[@jasondeng7677]

bruhhhh

[@daerdevvyl4314]

Srjan Shetty In the BONUS QUESTION, not the MAIN QUESTION. Pay attention.

[@lilchristuten7568]

00.17 you have just a minute to go through the portal. Explanation takes more than a minute.

[@medexamtoolscom]

Yeah really, you should have just thrown the 6 modules through the hole and stayed in the future yourself.

[@daerdevvyl4314]

lil chris tuten But the character doesn’t need to explain it. Are you telling me that you can’t figure something out faster than you can explain it to someone? Because I definitely can.

[@jasondeng7677]

1:41 now he knows where the lamb sauce went

[@mepnet]

Finally

[@abhishekjain3344]

"Whats the minimum number of nodules" Me: *Take 3 and a risk also* .

[@lukasnovella9001]

2:15 I thought we were traveling through time not summoning Satan

[@BytezBich]

Lol

[@justinharris3630]

XD

[@titaenic]

😂

[@MADKapo]

We're gonna resurect our mom, Al.

[@godyeeter7817]

lol

[@clockworkgamma]

Just leave him and take credit for the time machine , its a win win

[@math3000]

Sounds good to me

[@OJorEm]

Found the psychopath lol

[@saadawan5502]

Lmao 😂😂

[@mr.cup6yearsago211]

orange man bad

[@martinanastacio5040]

no use rushing through the portal... just perfect the time machine first before rescuing the professor. don't want to get trapped in prehistoric era... no wifi, no pizza delivery.

[@dailytofu7060]

Can you solve th- Me: no but I'll watch

[@ba.nguyen]

I solved it :D

[@anton-exe]

I'm kinda smart but I always just like to see how to solve it.

[@CactusJ7]

Hahahahaha, yeah😉

[@JBCIssac]

When people describe you as smart, but you can’t solve the TedEd riddles...

[@jongoagr9277]

Me and you,we have a lot in common.

[@neerajnandan3519]

I like how Ted ed says time travel riddle and just makes us learn geometry

[@mansidugar6781]

Ted-Ed: " Can you-" Me : " NO!" Ted-Ed : " But- " Me : " Well I'm gonna see the video anyway "

[@AN-ou6qu]

0:20 YO this scene is GORGEOUS!

[@Gallarday]

Oh wow it is Reminds me of a game.

[@channyt8818]

*When you finally got a riddle right even though you guessed*

[@violet8294]

lmao same

[@minipinkcrewmate9556]

Yea

[@NafeeDoesStuff]

You feel so big brained

[@mith_jain_here]

*me tooo*

[@thegreatmo5067]

lol 😂

[@FFjean]

I randomly guessed that 6 is the answer so that means im a legit scientist

[@tristanreyes8590]

Me too

[@ayooshiyer8621]

I am the sixth liker

[@oxen_nyx]

42 :V Same XD

[@merc6666]

Lol same i was like um 3 x 2 is 6 so 6 is the answer....?

[@thatfacewhenyoucheatedandg3957]

My favourite kookies are suga kookies. THAT IS WHAT I Did XD and also HI ARMY

[@porkbork3500]

To maximise the chance of survival, you might want to bring 5 though, depending on the chance of the portal collapsing vs the chance of the nodules giving a dead arrangement

[@PragmaticAntithesis]

Yep, the chance of 5 failing is only 12/1024

[@Thomas14717]

Explain please?

[@AmateurStorytime]

​@@Thomas14717There's only a 1% chance of failure to make a triangle with only five nodules, and since each additional nodule increases the likelihood of the portal collapsing while you're going through it, you're less likely to have the portal collapse on you if you only bring five nodules instead of six.

[@cosmicbrambleclawv2]

I like how the return portal just conveniently takes us back to the right time xD

[@farisakmal2722]

The nodules are fkin *raw* ! Okay wrong Ramsay

[@kln.b5631]

WHEREZ THE LAMB SAAAAAAUUUUUCEEEEEEE !???

[@farisakmal2722]

Thanks for all the likes😁

[@jessezong2507]

WHERES THE LAMB SAUCE

[@owlesent]

COME ON SUSAN

[@PrincessAshley12]

Nino would've made sure it wasn't raw, and have pictures to prove it.

[@gamerx7053]

OMG I can’t believe I finally got one of these riddles right. This was a good one!

[@shanematthews1985]

I know right, this one was actually kind of obvious though i guess? That or we're both just really geared towards understanding this sort of problem >.

[@XCM666]

I hate to be *that* guy, but still: Maybe you both lucked out, as the range of sensible options is pretty small here. If you didn't solve it the way the video explains, then make that a probably. So how did you come up with 6 as your solution? I got it wrong. I intuitively thought the answer was 5 (as 3 out of 5 lines have to be the same color). I had the right idea, but didn't think it through (you require a sixth nodule to take advantage of this circumstance).

[@shanematthews1985]

My instinct was that 6 would essentially give you a 6 pointed star, given that there were only 2 possible colour combinations 6 seemed like the mathematical choice given 2x3 and the layout giving you multiple points of contact

[@t_kon]

@@XCM666 by noticing that you'll need at least 3 edge of the same color to know it's possible (this one...is rather instict), then by php you'll need a minimum 5 edges connected to each vertex. Since it's a complete graph, hence n = 6 is the answer

[@kokorondeficit]

GamerX705 wait so you didn’t solve the robo ants riddle it had the most obvious answer you dont even need to guess it

[@ShiaTheBunnyGirl]

Answer: bring 12 nodules and use 6 per portal so both can escape time Easy peasy Lemon sandwich

[@dam8944]

Pokefan Alolagaming but u only brought with u 6 or u could just go through at the same time

[@nowonmetube]

Lemon sandwich??? I've never heard of that!

[@LumaLinaAndRosa]

Me too

[@spoonythegamer21]

LegendAdam09 if they brung 2 portals then they both go in each with 6 nodules giving them the same chance

[@kewmiemie1091]

@@spoonythegamer21 brung I wonder what brung means

[@anonymus3219]

For a second I thought this was a brilliant sponsor 0:39

[@leninsamson3847]

with the bonus riddle just bring 12 nodules and leave the other 6 for yourself or the professor, depending on who goes first

[@Justifier925]

The argument can always be that you were too late and your rushed decision came to this

[@Xzcouter]

Hey! I personally love this video cause I am a undergraduate math student and currently am basing off my research on this exact field of math (Ramsey Numbers of Graphs)!

[@t_kon]

I think it's generally known as coloring problems

[@daniele.parentmradamgamera2500]

Xzcouter Sukaiti that’s cool

[@destux]

Never though Gordon Ramsay was a time traveler

[@NA-ue1tv]

His dishes even satisfied them for the stone age.

[@Ve1v3tR4v3n]

Been looking for this comment lol

[@SreyaSanghai]

His first name and last name, both contain six letters..

[@destux]

@@SreyaSanghai Hey Ted Ed I found a much quicker solution over here

[@daveteves]

Thanks TedEd! Now I know how much modules I need when this problem arises.

[@EnderIzzy124]

Other idea, throw 6 chrono nodules through instead of you going through yourself. Presumably, the lab would have some sort of protocol for this sort of thing on the offchance of an accidental exposure, and assuming the portal always exits at the same place, all the doctor would have to do is wait for his return trip to arrive.

[@SpellProgrammer]

What happens if the professor walks away? We already know he's got a tendency to wander without looking where he's going, and he was reading a paper when the accident happened. Who's to say that he didn't realize what happened and just kept walking? Besides, the nodules are very small, and could be crushed by large dino feet very easily. It's not a bad idea, but there's too many things that could go wrong. Better to be there to mitigate as many problems as you can.

[@Silvergrooves42]

I'm super happy that my super quick solution turned out to be the correct one. I reasoned that if you had one stone as origin point and had random lines coming out, you needed to add enough stones for there to be 3 of a colour, since even if they didn't get the original color, they would still make a triangle. 6 it was

[@sssssarthak]

No, but still i'll watch and not understand the solution too.

[@msy6864]

Yea I can't think of an answer

[@BobMcCoy]

*It took me some **_time_** to solve this riddle*

[@av.keshavshastry7785]

True, it took me an hour but I did solve it!

[@av.keshavshastry7785]

Wow, i went through each case to solve, elegant solution!

[@gavinrand8368]

_Bob McCoy *lisa Guerrero would confront the time* I spelled that wrong didn’t I

[@faznapkin1631]

no *get out* 😂

[@ninaelmoyan3478]

Bud Dum CRASH

[@louisedriscoll3227]

Ted ed:your boss is trapped in time Me:🎵arms of an angel🎵

[@nikhilgarg9618]

Step 1: Confirm you have green eyes. Step 2: Throw a replica of the egg from 100th floor. Step 3: Ask, " If i asked you whether 2+2=4, would you say ozo?" Step 4: Divide the triangle into acute angles triangles with 7 cuts. Step 5: Give the box of pearls to sea monsters. Step 6: Cheat death by playing snakes and ladders. Step 7: Count the no of birthday candles. Step 8: Say, "You will release my brother" to save your bro and the creatures of paradox. Step 9: Say the name of the 5th house and the founder. Step 10: Press the button to save you and your friends from the 11 dimensions.

[@Thee_Sinner]

He went through the portal to figure out where the lamb sauce is.

[@ecom6ao]

y

[@zissler1]

Woosh

[@getoinked2818]

Ohhh That Explains It

[@fotinipapacharalampous5596]

Can you solve the time travel riddle? Off course I can't, but let's give it a try!

[@alex0125tw]

I love TedEd riddles

[@BytezBich]

@Unbreakable Patches what

[@DrGiggleTouch67]

2:27 Why is the top right nodule not animated like the rest?

[@MisterBrick42]

3:52 then how did we go through the same portal as the professor to get here

[@MatthewSmith-wx9wy]

0:12 Until, that is, he called you a donkey and said the meat is undercooked!

[@williamdunhan341]

😂

[@tacothealien9805]

where’s the lamb sau- THE ANSWER

[@davidwallerstein3113]

Ahaha I just chose 6 because it's two triangles together surprised i was correct 😂

[@pixellover2795]

we all did

[@coolsauce7771]

Same

[@TheThiccestChungus]

exactly like a cat

[@mmrow1634]

This is not a bad way to get an upper bound on the minimum for any kind or combination of polygons ("portals") formed by nodes ("chrono nodules") either. It's just a coincidence that for two triangles, it's also the lower bound and an achievable number. However for greater numbers of polygons or greater sizes of polygon, it quickly becomes extremely suboptimal, and hence Ramsey theory (amongst other areas of graph theory) that try to give better bounds or exact results. Or at least show that you can do it at all, is often as far as we get sometimes, too

[@reasatprottoy7488]

Make this a series called Ted-dle

[@jaysonirvingalcantara3949]

Or call it T series

[@propularguy]

I can only do the tissue thing haha lame jk

[@ceceoneill2517]

Me going through probability this year: finally knows the answer to a ted ed riddle

[@subagaming2075]

My first riddle i ever solved on this channel.

[@bobberry1463]

I guess 6 randomly does that still count

[@taakotuesdays]

Me too do we get prizes

[@ibbysajid167]

bob berry no

[@chinareds54]

As a theoretical math problem it works, but in practice you can just bring the whole box and activate one at a time until you generate the portal. It may happen by chance with 3, 4, or 5 nodules, and if it does activate with a lower number then it would be safer than activating 6.

[@ogeecheelime8868]

Why are you scrolling through comments? We both know you should be studying.

[@cristianlicea6350]

😭

[@waqqas6799]

Im at school rn lol

[@_bum_bunny_]

Stooopp, I have two essays I have to do that I'm trying not to think about

[@hecko-yes]

i _am_ studying

[@sketchyskies8531]

At school (lunch) rn

[@absolutelynot.3739]

Alternative: bring as many as you can and then calculate how many you need to use once youre through

[@billnoonan5928]

“You have one minute to go through the portal” Me calculating wether or not I can call ted Ed in that amount of time

[@viperwolf1272]

By the time i finished watching this video the window would have already closed leaving my professor stuck in history :D

[@0Sildar0]

I was hoping for some kind of paradox riddle :(

[@perison4611]

Is there such thing??

[@rolliepollie941]

You just predicted the future!!! kzbin.info/www/bejne/o4SYlniegbNobdU Are you a time traveler?

[@getoinked2818]

Here kzbin.info/www/bejne/o4SYlniegbNobdU

[@urielcastaneda761]

Or just bring all of them and keep throwing them until they work

[@ratfoot6490]

The more you bring the higher chance they have of collapsing while you are going through then.

[@yagentblueberry1144]

YOu can't win the lotteries if you don't buy the lotteries And the collapsing only happens when you throw them. Or go through them. so you argument is invalid.

[@jasondeng7677]

...

[@nazneenshereef]

How many nodules will u take? Me: 6 cuz we can make two triangles with it (lol) The only possible answer is 6 Me jumping around screaming: MOM get in here!!!! Ur daughter is smart😎!!!

[@dokchampa9324]

First Ted ed riddle I solved without pausing the video, so proud of myself

[@akshatshrivastava5947]

Thanks a lot for making riddle videos more often ❤❤

[@crispyein8601]

0:00 the way I type is phenomenal.

[@whatisthis2809]

Take a bunch and calculate when you get there, bring the extra back.

[@SuperPassek]

Solution to Bonus riddle. - We already know that there is at least one same-color triangle. Suppose the triangle is compose of nodes A, B and C, and ABC is a red triangle, and the other three nodes are D, E and F. - Suppose there are no other same-color triangle, to show contradiction. - As there are 5 edges connected to D, with the same logic, we can get a same-color triangle. As there can be no other same-color triangles then ABC, this same-color triangle we get from D should be ABC. It means that DA, DB, DC should be blue. - For the same reason, EA, EB and EC, and FA, FB and FC are all blue. - If any of DE, DF or EF is blue, we get a blue triangle, so DE, DF, EF should be all red. But we get a red triangle DEF in that case. So we showed a contradiction.

[@gravajaumbros]

Looking through the comments for one that explained the answer to the bonus riddle in a way I could easily picture. This was it. I know other people had already explained, but not in a way that that I could follow, so thank you for this!

[@a.iraven3922]

I solved almost every riddle on your channel easily and all it took was time and I figured it out

[@vincenzocontento6300]

I thought about this a little differently, not sure if my thought process is correct, but it gave me the same answer. Odds of getting all red or all blue triangle with 3 nodules is 1/8 (0.5x0.5x0.5) and because extra nodules create colours mutually exclusively, all you have to do is create 8 triangles with the least number of nodules (bc 1/8 x 8 = 100%). So I was just thinking of shapes and thought octahedron has 8 triangles and just 6 nodules. Could’ve been luck, I didn’t put much thought into the shape, just first one that came to mind.

[@scarletreilly2298]

This is awesome! I love new riddles.

[@aylacastolo5843]

Just throw the whole damn box in and make the professor do the damn work of going back

[@sonny8085]

I think the lesson here is that if you have an active time machine turned on in your lab, you should be more careful while wandering around.

[@phoenixarian8513]

I've read this question but in a different description. It's in a Chinese encyclopedia and it says: "You are the restaurant manager and you need to let a group of customers to seat. All of them has got strong emotions either good or bad against each other. You won't want 3 of them with the same emotions in between to sit at the same table or they might make trouble. What is the maximum number of customers to seat at each table?" And the answer is 5. With 6 there is a sure triangle.

[@RawAustin]

Never heard of Ramsey Theory before this, but I am somewhat familiar with basic Graph Theory. Looking at it one way, considering all the red edges yields a graph, while the blue edges form its complement. Unite them and you have a fully-connected graph, which forms the problem statement presented here. Coming to a similar conclusion to the video, for any given graph with 6 nodes, either the graph or it's complement will always contain a 3-node cycle, aka a triangle. Came to that result after a bit of brute-forcing some permutations, but hey! I got _something_ out of my Math lectures.

[@Nopenopenope412]

neat

[@neve6759]

I solved it!!! I’m jumping up and down in excitement. How I solved it: Step 1: take a whiteboard and 3 different color markers Step 2: draw a number of nodules and try to make it *not* work Step 3: if it doesn’t work, increase the number of nodules by 1 This was actually a fairly simple riddle, but I’m still happy with myself. Lol.

[@NurioMarayana]

That's a terribly inefficient method, and I doubt you actually did this. By the time you reached the answer, you'll have drawn 2^(3) + 2^(6) + 2^(10) + 2^(15) = 8 + 64 + 1024 + 32768 = 33864 different diagrams. Probably a bit less, because you'll more quickly find an arrangement that doesn't have a monocolor triangle in the 3, 4 and even 5 nodule setup. But for the 6 nodule setup, you'll need to go through at least all the 32768 diagrams to rule all of them out. That's 15 lines per diagram and 6 nodules per diagram as well, so that's 15 * 32768 = 491520 lines and 6 * 32768 = 196608 nodules drawn. Even if you draw like 5 nodules/lines per second (that's inhumanly fast), that still takes you 688128 / 5 = 137625.6 seconds. That's 38 hours, 13 minutes, 45 seconds and 600 milliseconds. And this even assumes you are inhumanly fast with drawing, took no time to think between drawings, took no time to double-check, made absolutely zero mistakes, found a non-monocolor setup basically instantly in the 3, 4 and 5 nodule setup, took no time to rest at all for anything, took no time to erase anything on the whiteboard, and have an almost infinitely large whiteboard. And you're saying you did all that?

[@rebeccavecchio4275]

Me: Ugghhhh 6? Ted Ed: The answer is 6 Me: Lol this is the first riddle I got right.

[@manavshah6831]

0:35 i love that sound when the sides turn blue

[@mellowords]

I must be dim, why doesn't the logic/demonstration at 3:00 also apply to a 4-node square? It seems like he's only using 4/6 of the points anyway

[@joseville]

2:47 For the 4-node square it is not the case "that every possibility has at least three connections of the same color coming from this nodule", so the same logic does not apply.

[@matrixphijr]

"What's the minimum number of nodules you'll need to bring to guarantee you create a fully red or blue triangle?" Me: Well, Prof., it was nice knowin' ya.

[@elephantarmy2938]

Quickly the portal is about to close Gives four days to figure it out

[@JadeyCatgirl99]

You bring a lot of them but only use them one at a time until a portal opens. You could get lucky and only have to activate as few as three.

[@loganwingenbach3834]

i would just grab as many as possible and then use them three at a time until a portal opened. this does create the chance of not getting a portal but using more than the minimum increases the chances that it immediately kills you when you try to use it.

[@LindsayOben]

I love these videos SOOOOOOOOOOOOOOOOOOOOO MUCH!!!!!!! I love how in each video there is a different art style!

[@michaelr3583]

1:00 I give up. He's screwed

[@jayfaisa6016]

I just guessed six... i figured 3 for red, 3 for blue... Couldn't think of a way to prove me right, though.

[@hairje1340]

4:05 TED-ED: This bonus riddle- Me:IS B.S. HOW COULD YOU HAVE GOTTEN TO THE PAST AFTER THE PROFESSOR STEPPED THROUGH IF IT CLOSES AFTER ONE OF YOU WALK THROUGH?!?!???!! This comment means no offense please don’t kill me.

[@royaleotter2763]

Oh it’s just because it’s a new one

[@elementgermanium]

Fun fact: Ramsey theory is also the source of Graham’s number! The original question was similar to this, but instead of triangles, the goal was a square/rectangle with an X through it, and the question wasn’t the number of nodes, but the number of dimensions a hypercube would need to have enough nodes. At the time, the answer was “somewhere between 6 and Graham’s number.” Which is basically the least precise statement that’s ever been seriously made. Nowadays, we’ve got a better idea: it’s somewhere between 13 and (2^2^2^2…) with (2^2^2^2… with 5138 2s) 2s. Which seems like a lot but compared to Graham’s number it’s basically zero.

[@jazz4362]

First TED riddle I got... Yay life💜💜💜💜

[@Ayush_28]

Questions on Instagram and FB "how many triangle's are there" turns useful.

[@julix_mango]

Bring as many as you can and keep forming triangular portals. EEAASSSYYY

[@jledragon]

I will guess Graham's number as an upper bound

[@xavierstanton8146]

With Graham's Number, you are finding the upper bound for the amount of dimensions a cube has to be in to be sure that a certain rule will always be followed.

[@jledragon]

@@xavierstanton8146 It was a joke directly referencing this problem (another problem in Ramsey theory)

[@xavierstanton8146]

@@jledragonOh. Imagine if Graham's Number was the answer.

[@NtlakaniphoMadlebe]

I actually answered right! I'm so surprised, because I thought about it for a while and weighed the possibility and thought six would be the right answer. I guess listening and observing actually does help.

[@goodalykcheese]

could you be able to do it with 5 by instead of going hexagon, you go a pyramid shape?

[@azizuladnan2957]

There's a time travel riddle!? Why have I never heard of this?!

[@edfreak9001]

It was before your time.

[@billyschweisguth1383]

Because it was only a few minutes old when you saw it...

[@jeffgriffin8329]

Because it doesn’t have anything to do with time travel. Just a geometry riddle

[@saumyashah7978]

Who else is never able to solve any of these?

[@carastark9163]

This one was the only Ted ed riddle I got right cuz by brain was like "it's a 50 chance to get either a red or blue line so 3 times 2 is 6" solved it

[@frostyblade8842]

@@carastark9163 that was me too

[@abdhullahazzam9896]

Me but I watch cause it’s interesting

[@sadsworth4605]

Me

[@ugandanmetalsonic8879]

ME not kno da wae to solve

[@gdal6961]

He literally took more than a minute to solve it.

[@chaichapstick]

You, the intern, are becoming a professional, your brain works faster w this data than a narrator would. A minute is all you need. Plus, narrator was explaining and talking v slow while doing so

[@lilchristuten7568]

@@chaichapstick Regardless of how fast the intern's brain works (it doesn't work any faster it just has more relevant connections to the subject) there would still be a delay in thought and action to to the sudden unexpected accident.

[@averagebriarmain]

the real way to solve this is to not save your professor, your already smarter than he was, he didnt put a barrier around the dang time portal, and walked into it accidentally when he was facing it

[@WizardOnDuty]

The audio clip of music + monkey sounds at 1:25 is from the point-and-click game Return To Mysterious Island. I have no idea how it ended up in this video, but that was a great moment of nostalgia for me. xD