I asked a question I had heard the answer to a hundred times: is it true that half the cells in my body are foreign bacteria? The answer turns out to be yes, roughly. Which is strange, because the version everyone repeats is that bacteria outnumber your own cells ten to one, and that version is wrong. The numbers In 2016, Ron Sender, Shai Fuchs and Ron Milo went and did the arithmetic properly. For a reference adult male of 70 kg: ...
My wife told me an amazing fact she had picked up from a Russian account on TikTok. For years, the story goes, scientists believed bats were extremely good at echolocation. That was how they flew around dark caves without constantly hitting the walls. Then one scientist X-rayed a batch of bats and found that many of them carried multiple healed fractures. Bats were not brilliant navigators after all. They were terrible at echolocation, crashing into things and breaking bones the whole time. They were just extraordinarily good at healing. ...