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Here is a link to the agar kit that I used so that you can do yourself! Last I checked it is only 18 dollars.
www.amazon.com/gp/product/B00...
In this video I show you just how dirty common household items are. There are bacteria everywhere! There are about a million bacteria cells per milliliter of water. There is more biomass of bacteria on earth than the combination of all plants and animals. In the video I test common household items to see which items harbor the most bacteria. In my experiment I spread my bacteria samples on tryptic soy agar plates. I sample the kitchen sink, the toilet, iphone, floor, doorknob, remote, mouth, toothbrush, my son’s stuffed animal puppy, and my skin (my armpit and belly button). Then I let them grow for 12 hours, and count the number of CFUs (colony forming units) there are on each plate. I do the same at 24, then 48, then 72 hours. After each time increment I count the number of bacteria colonies. The end results are shown below:
12 hrs 24 hrs 48 hrs 72 hrs
Sink 3 10000 10000 10000
Toilet 1 39 372 600
iphone 0 1 41 74
Floor 0 0 63 97
Doorknob 0 3 11 24
Remote 0 1 1 42
Mouth 0 0 950 1500
Toothbrush 0 0 0 1
Puppy 0 3 96 222
Skin 0 0 1 8
In the end the sink is by far the dirtiest place that was measured. The whole area that was swabbed on the agar plates was completely covered by 24 hours. The next was the toilet. The surprising results were that my skin and my toothbrush were the cleanest out of everything with my toothbrush only having one single colony of bacteria on it in the end.
For more awesome science, see my other awesome videos.
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Bacteria pictures credit:
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