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TIL the Alpine swift can stay in flight for over 6 months without landing once.

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R5jl8 TIL the density of Phobos, the larger and closer moon of Mars, suggests 25-35% of its volume is empty space
NX5J8 TIL former UN Secretary General Kurt Waldheim's voice was used to record the longest audio greeting to extraterrestrials on the Voyager Spacecraft; approx. 7 years after the spacecraft was launched, Waldheim was publicly accused of participating in war crimes by famed "Nazi Hunter" Eli Rosenbaum
LPdv TIL the sad lamp from IKEA’s acclaimed 2002 commercial was taken home by a crew member at the end of the shoot. When the ad agency asked for it back, they received a note saying “See? you’ve fallen for it. You’ve grown attached to the lamp, and you are crazy.”
e089b TIL that Harry Houdini in disguise would attend magic shows by people who claimed to be "spiritual mediums", knowing their trick, he would finally light a flashlight that left the deception in the open and stand up and cry “I am Houdini! And you are a fraud!"
VB16k TIL 150 years ago, 12 men in Cincinnati took a chance on baseball and changed the world being the first professional baseball team ever.