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TIL in 1984, a pipe-fitter for a uranium core processing plant in Ohio was discovered in a processing furnace. At the time the plant was discovered dumping a massive amount of radioactive waste into the atmosphere. Co-workers of the deceased worker suspected he was a whistleblower and was murdered.

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XEGOr TIL about Premium Bonds issued by the UK, which functions as a low-risk lottery. The bonds don't accrue interest, but every month prizes up to £1 million are distributed to select winners after a drawing. Even if you don't win, the government will buy back the bond at the original price.
ADnEo TIL of the doomed 1936 Eiger north face expedition. One climber died during a training climb and half the expedition left. Of the four climbers who remained, two fell during an avalanche, climbing rope wrapped around the neck of another, and the last froze to death inches from his rescuers.
459X TIL that despite being used to make balloons float and our voices squak, helium is a rare element (on Earth) which is only getting rarer due to the fact it floats out of our atmosphere. This is problematic, as it has useful scientific applications, and is currently essential in MRI technology.
R0Rl TIL that the death-sentanced murderer Joseph Paul Jernigan donated his body to science in 1994, and was then sliced horizontally into 1mm pieces for the purpose of creating a detailed data set of cross-sectional photographs of the human body.
yQxKw TIL there’s no scientific difference between pigeons and doves — the difference boils down to linguistic traditions.