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TIL Fruit flies have a gene named “Jim Lovell”, after the famous astronaut, which is necessary for flies to respond to gravity

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x6gYk TIL the iron oxide in some colors of tattoo inks (black or brown) can cause burn-like injuries to the skin of people getting an MRI scan
nPeB TIL: In Ancient Rome, women used opium-soaked tampons to relieve pain
D1kEv TIL "Foo Fighters" was founded by Nirvana drummer Dave Grohl as a one-man project. It was a nickname coined by Allied aircraft pilots for UFOs. Grohl named it after that, as he wanted people to feel that it was a group, because he had recorded the first record by playing all the instruments himself.
kOBnE TIL Typhoid Mary refused to wash her hands when preparing meals because she insisted on not having typhoid, even though almost all families she cooked for contracted the disease.
ZpDda TIL that scientists believe the earliest known ancestor of humans (and many others), Saccorhytus, was about a millimeter in size and lived between grains of sand on the ocean floor 540 million years ago. It also had a very large mouth, but surprisingly no anus