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TIL when Eagle of Apollo 11 was landing on the moon, the automated landing program tried to land in boulder filled West Crater. Neil Armstrong quickly switched to manual control, landing safely on a flat surface. Upon landing, the Eagle only 30 seconds of fuel remaining.

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9YlDB TIL that digital cameras were developed so spy satellites could send images back to earth more quickly. Before digital cameras in 1976, spy satellites used film. After the film was shot, the satellites loaded the footage into capsules and dropped them from orbit into the atmosphere for collection.
yVVWV TIL that placebos have been found to be an effective treatment for pain perception. A placebo treatment given to people who chronically suffer from migraine headaches was found to be just as effective as a widely used migraine drug, according to a study published in Science Translational Medicine.
BMjW TIL that astronauts in the ISS “do their laundry” by having new clothes shipped to them in an unmanned spacecraft that then has the old clothes put into it and is burnt up upon reentry.
ra9e TIL in 1967 a magazine published a fake story about extracting hallucinogenic chemicals from bananas to raise moral questions about banning drugs. People didn’t realize it was a hoax and began smoking banana peels to try to get high.
xVvZo TIL the world record for the loudest thing ever shouted belongs to an Irish teacher who shouted the word "quiet" at 121 decibels, the equivalent of a jet engine.