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TIL In 1858, Swiss astronomer Johann Rudolf Wolf published his formula for determining the daily sunspot number: k(10g + f); where g is the number of sunspot groups; f is the number of individual sunspots; and k is a calibration factor, different for each observer

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W7N68 TIL that "Desperado", the song by the Eagles, was recorded in London with musicians from the London Philharmonic Orchestra. Lead vocalist Don Henley was intimidated by the large orchestra, and would later express regret that he did not sing as well as he could.
vPmA7 TIL Hard Rock Cafe's memorabilia collection began with a guitar from Eric Clapton, who was a regular at the first restaurant in London. It hang over his regular seat in order to lay claim to that spot. This prompted Pete Townshend to send a guitar with a note "Mine's as good as his! Love, Pete."
VMWDG TIL of Roza Shanina, whose teenage brother was killed by Germans in WWII. Seeing how sad her mother was, she joined the Red Army as a 17-year old sniper and killed 59 Nazis as revenge.
WdJd TIL That after Germany invaded Greece in 1941, a German officer climbed up the Acropolis and ordered the soldier on guard there to surrender and replace the Greek flag with the swastika. Instead, the soldier named Konstantinos Koukidis, wrapped himself in the Greek flag and jumped to his death.
D0Gg TIL George Carlin was nearly aborted, but his mother change her mind minutes before the procedure.