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TIL that starting about 7,000 years ago in Egypt, seasonal rains started moving south until rain only now falls regularly on the Ethiopian highlands. This shift forced nomadic cattle herders to settle along the Nile, leading to the first permanent Egyptian civilizations.

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l7X8G TIL there's a "sex for fish" trade in some developing African countries, in which women have transactional sex with fishermen to secure their supply of fish.
kPM5 TIL that there is a current scientific hypothesis that the sun has a companion which is currently about 1-1.5 light years away. It is believed that it has an elliptical orbit which, every 26 million years, sends matter towards the Earth causing mass extinction events. Its nickname, the “Death Star.”
0dov TIL President William McKinley always wore a red carnation on his lapel for good luck. He was assassinated in 1901 just minutes after giving it to a 12-year-old girl.
LKBm TIL Wooly Mammoths survived on a couple of isolated islands in Siberia for up to 6,000 years after the species had gone extinct on the mainland.
PYyMV TIL that during Vostok 4, Russian cosmonaut Pavel Popovich said that he was able to observe thunderstorms from his spacecraft. However, he forgot that the Russian word for thunderstorms was the agreed upon code word for extreme nausea requiring immediate landing, and his mission was cut short.