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TIL The heat of the Earth's core has nothing to do with pressure. Rather, most of it is energy produced by radioactive decay and the rest is trapped heat remaining from when the planet formed.

Read more earthobservatory.sg

via reddit.com

jN44E TIL the first US-built tanks were too late for use in WWI but during the great depression the US army deployed six to disperse the BONUS army protest of WWI veterans
rNA94 TIL that average colour of the universe is called 'cosmic latte'. It was found in 2002 by surveying over 200k galaxies by astronomers and they created a polls on NPR and BBC to come up with a name for the colour. Some of the unchosen names were: Big Bang Beige, Skyvory, and Primordial Clam Chowder.
Lk40Z TIL whales create the longest-lasting songs in the animal kingdom with one session lasting up to 23 hours and the sound traveling for thousands of miles (estimated to be more than 6000km). At up to 180 decibels, it can also match the loudness of a jet plane.
WyZo TIL Thanksgiving was moved in 1939 to the second-to-last Thursday (from the last Thursday) in November by FDR at the request of the president of Macy’s, to increase the number of shopping days before Christmas.
oRe4r TIL most uncontacted groups choose to live in isolation, even though they know about the outside world. This is probably because they fear catching diseases they have never encountered before and getting harmed by traffickers and loggers.