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TIL 12 counties in Africa are building a 9 mile wide tree wall all the way across the continent to prevent the Sahara from advancing

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d8Ml8 TIL some WWII Allies who ended up in Switzerland were housed at the Wauwilermoos penal camp. Conditions there were brutal, violating the 1929 Geneva Conventions, and the self-appointed warden was a Nazi sympathizer. The camp was mostly ignored until 2013.
gje7 TIL that in Quake III Arena, when developers needed to calculate x^(-½), one used a piece of code and the hexadecimal number 0x5f3759df to calculate it about 4 times faster than floating-point division. It was so strange another developer commented in the code “what the fuck?”
ADNbg TIL The AC/DC album Black In Black is the second best selling album of all time in worldwide sales.
ne8jb TIL That the letter sent to NWA by the FBI is now enshrined in the Rock and Roll Hall of Fame.
D170e TIL Some organisms besides humans have passed the mirror test which scientists say suggests they have "self-awareness".