Diamonds, Pearls and Atomic Bomb Stones - Periodic Table of Videos

[@periodicvideos]

These videos are made by Brady Haran - check out his "Unmade Podcast" here: bit.ly/UnmadePlaylist

[@YoureWrongImRightGetOverIt]

This is so cool!

[@otterpop5551]

Dont tell anyone but you can easily break those diamond "windows'🤫🤫🤫🤫

[@unnamednewbie13]

Video teases my inner rock-collecting child.

[@positronundervolt4799]

Why did you stop?

[@neB_Storm]

The best rock I collected was an inch in diameter sized obsidian. It was found on the beach where we use to swim at when we were younger. It's the best because there were no volcanoes nearby, so I think it was washed up ashore from somewhere really far, or there could be a fault line below the ocean floor. As a kid I was amazed that all of us are made from the same elements from the earth. I was always fascinated by how everything on earth seems in someway tailored so that life can thrive on it. I think humans beings in general are made to be curious, always asking questions why and how. Maybe the reason why we, when we were just little kids, ask a lot of questions. We're just made that way and I really think that this is one of the characteristics that separates as from other animals. The endless thirst for answers to things we don't understand.

[@positronundervolt4799]

@@neB_Storm Nicest KZbin comment I've read all year.

[@bortflong5734]

Who doesn't?

[@sigurdbrattland7828]

ITS A MINERAL!

[@benjaminjernfors]

6:10 Asbestos is the common name for six naturally occuring fibrous silicate minerals. I work in demolition business in Finland and asbestos is something I'm very concerned about when demolishing old buildings (I wear professional respirator mask tho). In Finland it was banned in the 90's but it is still everywhere and I mean everywhere from wall glues to mortar paste to air conditioning pipes and especially around heat pipes. The blue/purple one "crocidolite" is the most dangerous and it will almost 100% lead to lung cancer if breathen even short period of times. It is 1000 times more dusting than the "safest" white asbestos "chrysotile" which is the most common in old houses. Asbestos is safe to touch and is harmless if not disturbed but if you break an object or handle already broken object containing asbestos it releases thousands and thousands of nano-sized needle like fibres in the air. When you breathe them in they get stuck to your lung tissue. Asbestos is really stable and non-toxic. It is chemically and mechanically resistant so when those nano-sized fibres get into your lungs they won't react with anything and won't dissolve but with every breath they stab deeper and deeper to the tissue. So the only thing your body can do against these tiny lung stabbing hypodermic needles is to contain them and produce more and more scar tissue around them until you have lung cancer "mesothelioma". With white asbestos the latency time is from 15 to 40 years before you might develop mesothelioma. With the blue one it is around 4 years and you will be in the coffin. WTC buildings contained around 400 tons of asbestos and when they collapsed majority of it was released in the air thus why lung cancer is the most common cancer and new cases are increasing every year in NYC among other respiratory diseases. Also the US government recently legalized again the usage of asbestos in construction materials not including cement.

[@revenevan11]

Why did they legalize it again? It's a public health threat which many are scared of, and I hadn't even heard of the bill proposing to re-allow it. Is there any pushback against it, or anything people can do to stop it from being used again?

[@jonathantanner2168]

Robert Miles on talking about AI safety research proposed the possibility of a KZbin comment that indeed needed to be cited because of the quality of information. I think this comment is nearly on par with that idea. It was very informative. Now... How do I cite it...?

[@fatdad64able]

Very interesting.

[@FruitingPlanet]

@@revenevan11 are you aware who is president in the US ? The Trump admin. has done al sorts of striping down environmental and consumer protection policies in favor of industry profits, this is not very suprising.

[@BTW...]

@@FruitingPlanet MAGA ... Make Asbestos Great Again ? No thanks.

[@WolfricLupus]

I had to pause the vid and say, my first thought is that I absolutely love the clock-powered, sun-reflecting device!! That's so cool!

[@ThZuao]

4:35 Professor, the first ever actual atom bomb was the one detonated in July 16, 1945, at the Trinity Test Site in New Mexico, US. Hiroshima bomb fell in August 6 of the same year, and was the first nuke to be used in warfare, the first Gun Type design nuclear bomb to be detonated (They were so sure it will work that didn't bothered to test it), the first nuclear bomb using Uranium to be built and detonated, but overall, the second nuke to be ever detonated. The trinity Bomb was of Implosion type, fueled by plutonium, and was identical to the bomb that fell in Nagasaki in August 9. The three bombs completion time is classified, but given the time between the Trinity test and the bombings, there's enough time to assume the two later bombs were built after the test.

[@rudybernal78]

i think he meant to say the first one used to attack with

[@chessengineer837]

+Thauã Aguirre impressive critic though :)

[@calumcookson740]

That clock and mirror is a boss level hack

[@nanotektor]

Seems like a clock coupled to an astrolabius, very clever indeed!

[@kefsound]

I wonder why we don't use it now.

[@H0kram]

@@kefsound Cuz we have light switched on and off at the tip of our finger, so we take it as granted and can be lazy about it, probably missing a couple geniuses in the process.

[@morganrobinson8042]

@@kefsound As cool as it is, you could do the same thing with a parabolic mirror and a flat mirror and maybe a lens to act as a spreader. Of course that requires a place that can make custom glassworks, and a quite bit of counter space.

[@Rohandutt]

That’s not a hack that’s an appliance If you still don’t understand this , you should think Then think about your phone as a hack

[@kjamison5951]

Martin Poliakoff is a natural diamond and priceless.

[@SandeepRao84]

I feel so ashamed being an Indian and not knowing much about C.V.Raman. The indian government should learn to give more exposure to the youth to people like this than promoting political figures and bollywood

[@raysills]

+Sandeep Rao .... and then there is the self-taught mathematical genius, Srinivasa Ramanujan. Another fine example of a brilliant person of India.

[@jeffogilvy5141]

Unfortunate he died so young...such potenial

[@racharlashweta7075]

+Sandeep Rao true

[@sirnukesalot24]

Unfortunately, it's the same everywhere. Everyone's focus is kept on various distractions from reality as well as on on the fake achievements of public figures who need us to think the world of them... I would slso have preferred that my country's education system treated the sciences as a kind of "history of the arts" style course that systematically takes you through the process of discovery from the discoverer's point of view instead of just glossing over the conclusion and assigning some seemingly disconnected labwork... If someone in the crowd is in such a position to do so, please develop it. Not as a college level elective, but rather as main coursework at the grade-school level.

[@kefsound]

Nationalism is silly, especially in science.

[@cansmashR]

Be very careful when handling potentially radio active material. Dr. Raman: send it thru the mail.

[@angelbygod7585]

👁👄👁

[@stygn]

I think I've been in that salt mine in Poland. A most magnificent place that would rival the mines of Moria or Erebor. Vast halls, with carvings everywhere. A number of churches, and an entire cathedral. One of the most beautiful places I've ever been, with an air so pure that it cleared the longs of asthmatics. Even the story of the mine would fit into Tolkiens works. I will not spoil the story for you, visit the mine, or look it up if you want to spoil yourself. I would love if you went there. Such beauty, carved out of rock and salt.

[@marcmoretti2502]

I was thinking the same thing, and I believe you're referring to the Wieliczka salt mine near Krakow. One of the most unique and beautiful places to visit anywhere in the world.

[@Jayfive276]

"Dr Raman - The Man Of Science." Now THAT is a Marvel Studios film I would pay to see.

[@allanrichardson1468]

Where do his famous noodles come in? JK. I did learn about Raman scattering experiments in physics class. Interesting to learn about the man himself. I once heard another story about a scientist with a collection. The American chemist George Washington Carver, known for his many uses for peanuts, was visited by a wealthy tycoon, who offered to give him a gift to reward him for his gifts to humanity. He asked for a diamond, and the tycoon, thinking he could sell it to help fund the lab, shipped a large uncut diamond to Carver. On a later visit to Carver's lab, Carver showed him his element collection, in progress. Sure enough, the unprotected compartment labeled "CARBON" contained the diamond! I wish I could remember the name of the tycoon, a well known Gilded Age manufacturer.

[@Muck006]

Yeah ... "Dr. Raman vs. Transformers" ... [insert a few calculations] "You could not possibly move like you do" {POOF} all transformers wink out of the movie and the battle is won.

[@aformofmatter8913]

Then Godzilla shows up and Raman wins the fight in three words: "square-cube law"

[@killmimes]

Not to be confused with: Dr. Ramen. - man of noodles!

[@diegomontoya3065]

Ugh. He learns to punch harder with the use of unobtainium, fights the cgi army and stops the skybeam the end. You owe me 1.25 billion dollars for "brown puma".

[@ianrogers5912]

This museum is absolutely amazing! Thank you for sharing it with us!

[@PointyTailofSatan]

Raman was a smart guy. He really used his noodle.

[@somebloke3869]

Great pun, I was looking for something like this.

[@krisanctil794]

Me like long-time.

[@michaelsinaloense6449]

Nice

[@skairymgaming2184]

@@somebloke3869 bro he is Indian his name is spelled Raa man

[@Rohandutt]

@@somebloke3869 the name in Hindi is pronounced more like Roman than ramen

[@DerangedTechnologist]

[Apologies if someone has already brought this up.] Remember that all ruby laser rods are synthetic; they fluoresce very brightly, even more so than natural ones. I'm not sure what prevents the synthetic specimen in Raman's collection from fluorescing well, unless perhaps the doping level is excessive.

[@zeromailss]

I feel like ive just visited a museum and got an amazing guide for the tour awesome video,need moar!

[@robertnett9793]

I imagine every museums tour guided by the Professor would be awesome :D

[@wiertara1337]

I was in Wieliczka, the salt mine in Poland. I was licking walls there. They are extremely salty walls :)

I was there too, me and a bunch of the lads had a see how high up the wall you can piss contest.

[@wiertara1337]

Seán O'Nilbud ...pissing contest? Damn...

[@crunch9876]

Does everyonlick the walls U lick? Lol

[@moneymayhem2000]

You know salt is more toxic than urine

You can take pragmatism only so far.

[@Khivraj_choudhary25]

Yes c.v. Raman.... Great scientist....from South India 🇮🇳

[@fleamau]

*heavy breathing* -hank schrader

[@iota-09]

+maurotron very slow breathing -hank schrader

[@discomfortzone]

Hahahaha

[@theyashbhutoria]

Those are minerals

[@richardorchard8554]

Great hair. This is eccentricity and academia done with style. Every man over the age of 70 needs a well developed and unique eccentricity. I’m still trying to work out where mine is going to go, I still have 20 years but I want to be prepared. You, Sir, are. Legend. Interesting stories, great hair. Love to you!

[@jwillisbarrie]

Thanks for having actual real captions for the Deaf

[@Skwisgar2322]

diamonds that size are very valuable mostly because the monopoly of De Beers. If they released their inventory diamonds would become pretty much worthless overnight.

[@poligon333]

They wouldn't be worthless but they would be much cheaper .

[@Saibrock]

Diamonds will never be worthless. They have real, practical uses in industrial and commercial applications, so there will always be a demand for them. But yes, the value of diamonds is kept artificially inflated.

[@TheUselessStoner]

Skwisgar2322 this is true.

[@HarryBalzak]

Skwisgar2322 He chose his words carefully. Most people would have said "rare", but he chose the perfect adjective.

[@ameyas7726]

***** and debeers have already invented a machine to tell them apart from their natural diamonds

[@michaelrose93]

For those interested in the mechanics of fluorescence, the UV light excites some of the electrons in the mineral, causing them to temporarily jump up to a higher orbit. Upon falling back, the extra energy is released as a photon, who's color depends upon the amount of energy it took to excite the electron in the first place, creating specific colors for different substances.

[@GoatzAreEpic]

Yup

[@davidbuschhorn6539]

Raman research institute. Where new Ramen flavors come from. College students owe him so much!

[@OhighOSkater]

I truly appreciate Sir Professor. Thank you for teaching us and keeping us interested in chemistry. You are a great man!

[@rodneyowen1850]

The Professor's hair looks an awful lot like asbestos. I think we should have it tested

[@chickenfriedbobcat6090]

Well, that proves Richard Pryor and Michael Jackson's hair were NOT made of asbestos.

[@thedoctor2102]

He looks like a classic mad scientist

[@sharkedog6007]

Lol

[@josesequera-andrade2386]

Funny thing. Crocidolite isn't the only "asbestos". Asbestos is just a description for minerals that crystalize into long fibers. Anyway chrysotile is the most common asbestos type used in the US and if you look at it under a microscope it actually looks a lot like his hair. The way my boss described it (I work in an asbestos lab) is that it looks thin and wispy like old lady's hair.

[@saltysoysauce954]

@@josesequera-andrade2386 Asbestos lab? Interesting, what do you do there?

[@darkmage07070777]

A genuine clock-work lamp?! That's steampunk level stuff!

[@deeprecce9852]

India has some really brilliant scientist..and in my books sometimes India is really underated in terms of scientific contribution! Well Done India!!

[@Gunzee]

I still remember the first floor of the natural history museum. It had an amazing collection, I'd spend as long as I could looking at all the rocks and minerals. Wish this was longer going over each piece.

[@Lornda]

would of loved to here the prof's explanation for why the natural rubies flouresed but the artificial one did not. probably where the natural ones absorbed some other materials whist forming and the artificial one in the lab is in a very pure environment. but i would of loved for him to teach me this quirie

[@rmxmike]

I was under the impression that it was artificial rubies which fluoresced as they deliberately put a dye in them. I saw a Nat Geo documentary decades ago on gemstones which included the manufacturing process. The company director said that they’d been offered massive $$$ to leave the dye out. Also, I have a faceted artificial ruby which I bought at a gem show... It does fluoresce under UV. It comes up orange. Was fairly inexpensive, too (I’m an amateur gem collector and gold/silversmith).

[@robinswamidasan]

@paul austin That should be "corundum", which is Aluminium Oxide with trace impurities in crystal form. Carborundum is a trademark for silicon carbide, and is used as an abrasive.

[@KitChen5548]

They're minerals, marie

[@RandomExperiments]

This is such a beautiful collection and I love the stories about some of the pieces. Really nice video! :) It reminded me of Raman spectroscopy at once.

[@Muck006]

The "asbestos rock" nicely shows one of the basic rules when dealing with the stuff: DO NOT BRUSH IT!

[@saltysoysauce954]

Do not *break* it, brushing won't get those fibers loose.

[@simonpeter5032]

4:26 Atomic Bomb stones you came to see.

[@thecianinator]

Thank you

[@stevenboelke6661]

Raman? Light? I have a Raman spectroscooy device in my school's nano lab

[@jewberggoldstein7112]

Is it named after him I don't think so?

[@PallabDutt]

Yes it's named after him.

[@Khivraj_choudhary25]

हाँ भारत की

[@riche4you1975]

6 years ago this vid comes out and only now recommended! Great vid.

[@paparoysworkshop]

6:18 I had some of that stuff when I was a kid. I often picked at it and over time, it became smaller and smaller and eventually, not enough left to keep. So don't worry about picking it up. It won't bite...

[@ghost_ship_supreme]

I believe I have a chunk of steel slag crystals too! I never realized it, but I picked up what I thought was a black rock at a store and it looks very similar! It tends to fall apart when you touch it, so I put it in a cabinet where it can’t get damage.

[@korpakukac]

Interesting video, but I really miss having a lenghty part about Raman Spectroscopy, which is named after him and used worldwide for identifying minerals.

[@pluransart1795]

I live in Bangalore and I didn't know this place existed!

[@Videohead-eq5cy]

Bangalore is one of the most active cities in India when it comes to interacting with the outside world. It's the music capital, the science capital, and there's a lot of cool stuff in the city

[@fugamantew]

Dr. Raman was a titan of scientific research. What a marvelous man of science he was!

[@MrRockingharsh]

how can people dislike these videos. The professor is a delight to watch!

[@Toastmaster_5000]

they're MINERALS... oh wait.. he already said that.

[@kurtstory9466]

I would like to comment on the larger ruby which Martyn has dubbed "artificial" at 5:55. The crystal habit and surface striations indicate a natural ruby/corundum crystal--not a flame-fusion synthetic. Many natural rubies fluoresce, but others don't. The difference is usually due to the presence of iron, which quenches the fluorescence over a certain amount. Synthetic rubies tend towards higher amounts of chromium and often fluoresce brighter than natural, since they have little iron. I'm unsure if this statement is from Dr. Raman's notes or Martyn's; my sources are gemological journals and mining corundum. But don't take my word for it--consult a mineralogist or gemologist whom you trust.

[@mrzulcan4290]

I'm not into science but I find this quite interesting to know about certain mineral collections. Good to watch more about the famous Dr Raman.

[@monkfoobar]

5:00 “...quite careful...send them to me...” so much for the mail man that delivered them.

[@465maltbie]

Thank you for taking the time to share this with us...I admit that I used to collect minerals as a child but have not done so in many years. Now I must go and pull out my box and look through them...thank you again.

[@elquemando]

04:32 Hiroshima was not attacked with the first atom bomb. The first A-bomb detonation was at Trinity Site in southern New Mexico, some 100 km (or a bit more) north of Las Cruces.

[@milesjambeau3241]

Trinity is a testing ground Hiroshima was the for to be attackec with the Intent to destroy

[@papaversomniferum5247]

Idk why people hate on people with rock and mineral collections, this is an investment, while you are out wasting 50-100 bux on alcohol that won't get you anything worth money the next day, yet these types of people buy 100 dollar crystals, and have something worth that much and most of the time will be worth more in the future!!

[@JoeBribiesca]

What an excellent vid! Brady, don't stop making these with the Prof...er, I mean, Sir Prof. lol I don't live in the world of academia, nor do I have any advanced education. I actually work as a dimensional metrologist for an automotive manufacturer here in the States, but I freakin' love these science videos! :)

[@jessechen998]

How come artificial ruby doesn't florescent and the natural ones does?

[@OOZ662]

Artificial ruby is "pure." Contaminants in the natural stones are what make them glow, just like the bigger rocks excepting the contaminant is dissolved more finely so it doesn't look like scales or large chunks.

[@jimbob7568]

@@OOZ662 corundum fluoresces regardless of it being natural or synthetic, it's probably a contaminant inhibiting fluorescence

[@ValThracian]

@@jimbob7568 Or maybe the "artificial ruby" is made out of cubic zirconia.

[@josephjackson1956]

Nice rock collection, Dr. Raman Noodle

[@metocvideo]

An outstanding man of science.... talking about another outstanding man of science. Wonderful.

[@nannesoar]

I love the way he displayed those opals.

[@digitalghosts4599]

He truly was a man of science!

[@yogidemis8513]

I read about this dude. He was a certified genius! He lived a interesting life!

[@RickyPisano]

Boil 2 cups of water and add sugar to saturation. Cool and hang a thread into the center of the solution. Put in a place where it won't be disturbed and it will grow beautiful crystals. You can grow them any color you like by adding a drop of food coloring. Really cool.

[@mrkanenas]

He is the kind of proffesor who motivates you to be a scientist

[@louiskohnke2343]

Ahh yes, the nostalgia: Pokémon Diamond Pokémon Pearl Pokémon Atomic Bomb Stones

[@johnnyscott3698]

If you ever go to NZ, they have a classic mineral collection in contemporary labs at Thames with an original gold battery that is still operational. It is utterly unique

[@pk-pj4sz]

so cool Way cooler than the stuff I looked at when I was a kid

[@crankyyankee7290]

There are some recent comments on here,so I will add this-Years ago I worked in a place that for one thing assembled windows for nuclear reactors(they fused the stainless collars to the windows) the lenses were made of synthetic sapphire quite thick,and some a couple inches across,the alignment of the grain of the stone had to be perfect,or the sapphire was scrap(at one time I had bag of sapphires impressive but pretty much worthless) and my father had a couple assembled windows that the grain had gone off on, during manufacture,so while building himself a wood stove,he installed a large sapphire window in the door.. The sapphire when grain and alignment was correct apparently stopped the radiation, when misaligned-not so much

[@sabin97]

since the professor was knighted, shouldnt he be called sir professor now?

[@Mp57navy]

It's either "Sir" Or "Prof. Dr." Afaik.

[@MrBartleby451]

It would be Prof. Sir in that order, but only formally. Day to day it would be Prof.

[@lexagon9295]

Mp57navy Nope, it's Professor Sir Martyn Poliakoff. It's never Professor Doctor, it's just Professor. In 99% of cases, being a professor implies that you have a doctorate, so the Doctor-title becomes redundant.

[@W0mpa]

MrBartleby451 A great order... Professor Sir... ;)

[@ffejpsycho]

+sabin97 Couldn't we just Portmanteau it to 'Professir'

[@TOP10-d4j7t]

love his periodic table tie

[@Linkwii64]

What they are missing in the collection are lighting crystals. created after the lighting had strike the ground. You will have to be extremely lucky to find one.

[@VallornDeathblade]

Your mean Fulgurite right? Considering the other minerals he had there I'd be unsurprised if they had some but just didn't show them on this video.

[@Linkwii64]

Vallorn Sorry for the late reply, but I am not sure what they call them.

[@DustinRodriguez1_0]

He mentioned furnaces at a steel mill turning off and cooling down... I worked doing IT stuff for a steel mill for awhile and they said if the furnaces were ever allowed to cool down, they would be destroyed and would cost millions of dollars to repair/replace. I hope it was a different kind of furnace they were using!

[@salogel88]

Finally found out that that rainbow-stone that i got from my aunt years ago is carborundum crystals. Thanks a lot. Interesting collection.

[@medexamtoolscom]

So why does natural corundum fluoresce but not the artificially grown stuff? I bet the artificially grown aluminum oxide crystals are too perfect, they're just straight up aluminum oxide with chromium oxide whereas the natural ruby has some other junk and imperfections at the microscopic level in them.

[@TheGodParticle]

Such a amazing mind, photographic, I so wish my mind was photographic. Cheers people

[@douro20]

Silicon carbide is used in steelmaking as a "fuel" as it is reduced to silicon and CO2 during the smelting process and the formation of silicon dioxide from oxygen used in the process is highly exothermic.

[@planetengineeringofficial8545]

so why does natural ruby flures and artificial doeant? :)

[@IanTester]

I'm guessing there's something else in the natural ruby that does the fluorescing.

[@planetengineeringofficial8545]

Ian Tester no shit sherlock

[@martzink]

сталкер чворович I'd suspect that the crystal bindings are a bit different at least.

[@StanleyKingChan]

The same way the other rocks fluoresce; they absorb UV light but some of it gets converted to visible light. The artificial ruby simply doesn't have the same crystalline structure and chemical composition that the natural ruby has.

[@teliots]

The makers of artificial ruby do that intentionally so that you can tell the difference. They could make it glow if they wanted to.

[@kellyfrench]

What is the name of the clockwork mirror shown near the beginning of the video? It reminds me of the special motors you can get for telescopes for allowing long-duration astrophotography by compensating for the rotation of the earth.

[@desvlogs2352]

a mirror with a clock

[@facingmydragons]

That is precisely what it is! It's basically a mechanical clockwork.

[@tolkienfan1972]

I love these videos

[@sitarasrini3138]

dear prof, are you still in india? its probably too late, but i'm really happy to see you make videos in the same city i live in!! would have loved to meet you and Brady.....keep up the great work! love your channel.....hail chemistry!

[@dg-hughes]

It's incredibly expensive to restart a steel mill especially a mill that refines aluminum. Hey why didn't the man made ruby glow?

[@JetBalrog]

+David Hughes I'm willing to bet that the manmade ruby doesn't glow because the thing that makes the natural rubies glow is an irregular impurity of some variety that the manmade ruby doesn't have.

[@TehNewV]

+David Hughes Natural ruby and diamond have molecular clusters of trapped nitrogen gas within the crystal structure. Under UV it becomes excited and glows. Some artificial diamonds do this, but the pattern is usually square/cross-shaped instead of consistent all the way throughout the stone. I would love it if they perfected the gem-growth process to include nitrogen so they would glow the same. Or perhaps even make hidden text within a stone that glows.

[@iota-09]

+ＮｅｏＶｅｓｕｖｉａｎ or even give a pattern, like a diamond-shaped chessboard pattern, it'd be pretty cool.

[@adamsymborski1520]

I find the professor really quite exciting.

[@rafaelmacas]

Professor, you look so charismatic that my dream is to give you a hug one day! By the way, excellent video as always!

[@onesimpleclik]

I would love to see a few more videos like this of C.V Raman's collection :)

[@Rattletrap-xs8il]

When he showed that mirror thing at 0:46 all I could picture was Ramen yelling, "Aziz! Light!"

[@sadpanda9455]

How has this comment been up for three years and just now got its first like? That is exactly what I thought when I saw the mirror too!

[@rayh592]

When I was a kid, I had a mineral collection that came with asbestos. That was the 1960's. Of course, the town also had an asbestos plant. Everyone knew if you worked they you would for a young, painful death, but the pay permitted the family to afford college and live well.

[@thebestofall007]

Good to see some more videos coming from you guys. As I predicted, you show us a box of rocks of some sort and you make it interesting. Thank you.

[@andyshelly3473]

where have you been my old friend , i miss your great work , love science its my language .

[@rohitpyngottu6066]

jealous professors are disliking these amazing videos. grow up, dudes.

[@oliu469]

3:45 Sorry cant understand name of it, i hear something like "camporandum" what the name of those crystals?

[@samanthaqiu3416]

That mirror-clock would be a fantastic steampunk decorative device for the home

[@AdroitJake]

I'm in citrus county Florida. We have tonnes of old sulfur mines all around here. I occasionally find them randomly in the woods. HUGE sunken caves....in Florida. It's strange to see

[@trvsconway]

This is one of my favorite videos thank you so much for sharing

[@gordybishop2375]

Would love to get all the details on the solar reflector at the beginning please

[@jasonketchum4052]

This collection is spectacular! Thank you for sharing

[@professorsogol5824]

2:16 The quartz crystal contains water with carbon dioxide and methane trapped when the crystal was formed. What information about the environmental conditions that existed on earth many thousand (million?) years ago can be deduced from the examination of such crystals?

[@RikthDcruze]

i cant thank you enough for bringing us such an amazing video

[@konkoroid]

where can i find those tie?

[@The1Helleri]

What kind of crystals are white and green (sort of smeared). And, fluoresce green in the dark (with out a black light)?

[@Luceked]

This salt crystal from Poland is probably from Wieliczka, a salt mine thats no longer operational.

[@Olhado256]

That salt mine in Poland was probably Wieliczka near Cracow. It would be an awesome place to make a video about salt!

[@LutzDerLurch]

3:05 "I've never seen such large crystals of sugar in my life" Visis east frisia, and look for 'Kluntje' in any regular grocery store. It's what you put in the Teacup first, ;)

[@5HT2A292]

Haha. Stimmt.

[@mithrandir491]

wow..he has such a nice collection.

[@chauhanrajput4733]

The worst thing here is people from great countries like America disrespects this brilliant aged man. DO RESPECT THIS PERSON...

[@beinbrek]

The Grand Rapids, Michigan museum used to have a a very impressive display of minerals which fluoresced under UV light in their rock and minerals section. The section, along with a friend, was what got me interested in Rock and mineral collection as a kid. Back in the 1960s it was easy to get Chrysotile for young collectors. I owned a sample. I also owned another mineral sample I doubt the Professor would want to handle casually, Cinnabar, the mineral from which mercury is mined. It wasn't hard at all for collectors, including younger ones, to get their hands on some pretty dangerous minerals back then. My interest in rocks and minerals was one of the reasons I took Chemistry as my required Science sequence in my first year of college. I loved it and would've loved to add organic and biological Chemistry had I had enough room in my major to do it. Sadly, I didn't

[@mattibboss]

Hi professor I was in that salt mine in Poland it's called Wieliczka and the workers gave me a salt crystal it is like 6x2 cm (idk exactly) and some friend of mine gave me his one(he didn't need it) it was arround 6-7-8 years ago (I'm 17) and i have that 2 crystals(no idea where but i have) (yes i did lick them :) and anyone who can should try) if you don't have something like this and you want to have i can send you one (becouse you said that you didn't have seen big ones (idk which size you meant) If you want one i can send you just pm me (i don't send it until you tell me becouse you might have half a ton of it already and putting next on top has no sense)

[@kanjitard]

There are sugar mines in Poland?

[@mattibboss]

***** en.m.wikipedia.org/wiki/Wieliczka_Salt_Mine English i always get something epic wrong :( salt salt salt i had English for few years..... epic fail!

[@szymongorczynski7621]

There's actually a few mines, but Wieliczka is the most famous one.

[@ButterBallTheOpossum]

Periodic table of videos: Do a video on super acids! That would be sooo awesome.