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TIL about mass suicides; occurring as early as 206 BC in Astapa to as late as 1946 in Bali, Indonesia. These mass suicides, which can reach a toll of thousands, are a form of political protest of defeated groups against their aggressors and are regarded as an honorable act of heroism.

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E1GAd TIL that the concrete used by the Roman Empire has been proposed as an alternative to modern concrete. It's believed that it would have a substantially smaller environmental impact than our own in addition to being far more durable, surviving thousands of years in harsh conditions nearly unscathed.
0bLA TIL despite having DNA evidence of the suspect, German police could not prosecute a $6.8M jewel heist because the DNA belonged to identical twins, and there was no evidence to prove which one of them was the culprit.
b9Aj0 TIL that female tears contain chemicals which can decrease sexual arousal and aggression in men.
4dBg TIL Yale researchers may have discovered the true root cause of depression: Not too little serotonin,rather it’s too much of another neurotransmitter called acetylcholine. A secondary effect of SSRIs is they reduce acetylcholine, which May explain their antidepressant effects.
JZw1 TIL In 1924 Paavo Nurmi won four golds, but couldn’t participate on the 10 000 m: “Nurmi was so furious that he took to the warm-up track next to the stadium and ran the same distance at the same time. Ritola won gold with a world record, but just outside Nurmi had finished first.”