When I was a kid, my parents told me that everyday items are always filled with bacteria, such as banknotes, tabletops, keyboards, smartphones, floor (pick up your fallen food within 5 seconds or it will be infected with bacteria), I grew up told there are millions of bacteria under the fingernails all the time, is this really true? How can they be always there and survive that long if they are on the floor, banknotes etc.? They are living organisms, need to eat something, right? For my thinking there is nothing to eat on the banknotes normally. Can anyone bust this myth or confirm? Thanks in advance.
In: Biology
Did you ever hear about the science fiction scenario where someone invents nanobots and they take over the world in a [gray goo](https://en.wikipedia.org/wiki/Gray_goo) scenario, relentlessly turning everything they touch into more of themselves?
Well we live in the aftermath of that scenario. Hell, we *are* the aftermath of that scenario. Literally every niche that’s not lethal to dna-based life is full of dna-based life. Most of the biomass on the planet is bacteria. Heck, most of the cells in your body are bacteria. So, yeah, bacteria are everywhere.
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