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TIL National Geographic magazine was the first U.S. publisher to establish a color-photo lab in 1920, the first to publish underwater color photographs in 1927, the first to print an all-color issue in 1962, and the first to print a hologram in 1984.

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grBx8 TIL about the Birmingham Rollers Pigeons - approx. 1,500 in LA, mostly areas with gang violence, that train pigeons to somersault mid-air!
BgBMd TIL when a chimpanzee that learns an effective method to crack nuts open is placed into a new group that uses a less effective strategy, it will eventually stop using the superior method just to blend in with the rest of the chimps.
Z8DbQ TIL that a 'mirror box' can be used to alleviate phantom limb pain. The patient places both their good limb and residual limb into the box and the mirror shows the reflection of the good limb. This allows them to 'move' the phantom limb from painful positions.
9GgX TIL that planets “emit sounds” by pulsing with radio waves, which can be picked up by radio antennae. The Earth’s noise is sometimes referred to as Earth’s “chorus” because it sounds a bit like birds chirping.
W7kB TIL Carl Sagan recorded a message for those who would make it to Mars. “Whatever the reason you’re on Mars is, I’m glad you’re there. And I wish I was with you.”