sciencefocus.com

DQvBe TIL that chainsaws were originally invented to aid childbirth.
6985m TIL that if all the world’s bacteria were laid end-to-end, they would reach 10 billion light-years in length. However, at 75 times thinner than a human hair, it would still be invisible to the naked eye. The length could wrap the Milky Way more than 20,000 times, creating a 2cm wide visible ribbon.
W7gVY TIL that planets can appear in retrograde motion to the earth for some time. TIAL that Mars does that every 26 months, Venus every 18 months, Mercury 3-4x a year, Jupiter, every 9 months, Saturn, Uranus, and Neptune every year-ish