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TIL a 2018 study found that male gorillas who participated the most in babysitting duties sired more than five times the offspring as male gorillas who avoided child care. Male gorillas are "often quite snuggly, letting infant and juvenile gorillas cuddle, play and just hang out in their nests."

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JYKb8 TIL The influenza epidemic of 1918 killed an estimated 675,000 Americans (far more than the 53,402 who died in combat in World War I). The impact was so profound as to depress average life expectancy in the U.S. by >10 years & may have played a significant role in ending the World War 1 conflict.
W7ppN TIL that there are only 28 different ways dates can be arranged in modern calendars. Depending on leap years, you can reuse old calendars every 6, 11 or 28 years until 2100, which will change the pattern.
jNXBj TIL that humans, aside from domesticating animals (livestock, pets) and plants (crops) also domesticate themselves. One characteristic that all domesticated animals including humans have in common, is a smaller brain compared to their wild ancestors.
xVw5D TIL Large sections of Montana and Washington used to be covered by a massive lake held back by ice. When the ice broke it released 4,500 megatons of force, 90 times more powerful than the largest nuclear weapon ever detonated, moving 50 cubic miles of land.
8dP8 TIL that Alaska is not only the northernmost and westernmost state in the United States, but is also technically the easternmost as well because it crosses the 180° meridian of longitude