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TIL Roman concrete structures such as the Pantheon and aqueducts are ultra durable because of lime clasts. While many modern concrete structures crumble after a few decades, Roman concrete has self-healing functionality from lime clasts which allow their structures to survive millennia.

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b9p8Z TIL a recent survey of the total Mountain Gorilla population estimated there are at least 1,004 individuals, reflecting a substantial increase since 2008. Due to this upward trend in population, their status has been changed from Critically Endangered to Endangered.
vLLB TIL the city of Cincinnati has a subway system that was built and never used.
7rMeO TIL - Reindeer are the only species of the family cervidae where both males and females develope antlers. But this isnt the best part. Males loose their antlers in autumn, while females keep theirs until spring of the following year. This means Rudolph and all of santas reindeer are female!
epK5J TIL: The 6 Mitford sisters were a famous aristocratic family heavily involved in wildly different political scenes in the 1900s. Unity was a close friend of Hitler and visited him often, Diana married the leader of British Union of Fascists, Jessica joined the American Communist Party, etc.
nW7r TIL 61 yo Cliff Young ran an ultramarathon and broke the record by two days. He had no formal training, ran with no sleep, and beat sponsored, young athletes. He remarked that the race “wasn’t easy.”