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TIL consumption of a polar bear's liver can cause hypervitaminosis A. In severe cases, it can cause full-body skin loss, leaving the underlying flesh bloody and exposed

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4XG8X TIL of Ralph Bunche, a Black American diplomat who: was the first Afr. American in the US to earn a PhD in PoliSci; worked for the OSS in WWII; helped design and create the UN; won the Nobel Peace Prize for ending the first Arab-Israeli war; 'invented' peacekeeping; and marched with Dr. King
mx0EY TIL when the Hoover Dam was being drafted, the engineers calculated that it would take 125 years for the concrete to cool if done in a single pour. Instead they poured it in sectioned blocks, some as big as 50 square feet and 5 feet high.
kywE TIL That Julius Ceasar’s only biological son, Caesarion, was the last Pharaoh of Egypt.
QN0Ad TIL that the world's quietest room, an anechoic chamber located at Orfield Laboratories in Minnesota, can drive people to the point of madness. The room is so quiet people can hear their own blood flowing and even the sound of their organs functioning, which can be disorienting and unsettling.
mxrxO TIL Ducks can keep their eyes open underwater due to a transparent third, sideways eyelid called a Nictitating membrane or haw. All birds have it and even humans have a vestigial remnant called the plica semilunaris.