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TIL Hindus believe in cycles of existence. According to the text dating 3rd to 10th century CE, it's currently 'Kali Yuga' - the Age of Discord. Attributes: widespread disease, degradation of environment, earthquakes; increased animosity and murder, mindless hedonism and the rich suppressing poor

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YYlr TIL that submarines were originally detected by sensing the way they distort the Earth’s magnetic field. Now submarines have copper wires (with 4,000 amps running through them) wrapping the hull to demagnetize the ship to avoid detection.
x6OD5 TIL that sloths can hold their breath underwater for up to 40 minutes, far surpassing dolphins, who can only manage about 10 minutes. Their secret? A super slow metabolism and specialized lungs that allow them to conserve oxygen and avoid predators even in water.
db1E TIL of Agent Garbo, a double agent in WW2 for Britain. Initially rejected by Britain, he then went to Germany, claiming he could share British intel. Germany welcomed him, and he gained their trust. He again offered to help Britain, and was hired. Garbo fed fake intel to Germany for the entire war.
M7rj0 TIL about Daniel Daly who was awarded the Medal of Honor twice and was nominated for a third for his actions in WW1. He was denied his third Medal of Honor but was instead awarded with Navy Cross, the Distinguished Service Cross, and the French Médaille Militaire
RlKa TIL: One of the largest babies ever born (18lbs) grew up and gave birth to the largest baby ever born (23lbs.)