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TIL before synthetic plastics were invented, a substance called Hemacite was widely used to make everything from roller skate wheels to doorknobs. Its ingredients are blood and sawdust.

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GY9W7 TIL that the commonly known information regarding Daddy Long Legs as being extremely venomous with brittle teeth not strong enough to bite humans is actually a myth. Scientists have no idea how this factoid spread.
LkgoZ TIL "Throwaway Living", a lifestyle of using single-use plastic items was promoted instead of cleaning up after. LIFE magazine (1955) - "The objects flying through the air would take 40 hours to clean, except that no housewife need bother. They are all meant to be thrown away after use."
M744a TIL Starting as a joke, a Duke university researcher brought a portable scanning electron microscope into her home. Then the organization realized it wasn't a bad idea as she used it for virtual outreach activities
Xxk6 TIL Medal of Honor recipient, Master Sergeant Roy Benavidez fought for 6 hours straight and had 37 puncture wounds, exposed intestine, broken jaw, and eyes caked in blood. He was pronounced dead until he spat in the face of a doctor who was zipping him up in a body bag.
OoRYa TIL that 85-90% of cancers are due to people's environment and lifestyles