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TIL Over 15% of American soldiers in the Vietnam War were addicted to heroin, yet over 95% quit completely upon returning to the US

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GAJbE TIL Vitamin D deficiency makes sun exposure rewarding, as an evolutionary mechanism to encourage animals to get enough vitamin D. Once vitamin D levels are replete, sun exposure no longer produces euphoria
xVgJw TIL that when all cables were suspended form poles, the insane number of cables created a rather strange and sometimes even scary streetscape.
4kgAw TIL that If you do not want to your child to be spanked at school in Texas, you have to explicitly say it in writing.
wL5B6 TIL Spain brought back so much Aztec gold that it caused massive inflation and crashed the economy of Europe.
wV1E TIL a police office from South Korea went on the 2nd largest killing spree in history after an incident with a house fly.