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TIL that it takes four or five generations of monarch butterflies to complete the annual migration from Mexico to northern USA/Canada in the spring but in the fall a single "super generation" completes the entire 3,000 mile journey.

Read more news.nationalgeographic.com

via reddit.com

Lk8eV TIL of Valentin Dikul. At 16, doctor's told him his legs won't work after sustaining a back injury. He taught himself rehabilitation, became a circus performer, and is now the head of rehab of MSK diseases in Russia. He is known for juggling his famous 80kg kettlebell
4X0V6 TIL on July 23, 1982, a Bell UH-1 Iroquois helicopter crashed at Santa Clarita, California, during the making of Twilight Zone: The Movie. The crash killed three people on the ground: actor Vic Morrow and two child actors while injuring the six helicopter passengers.
wLvx1 TIL that some spider species mimic ants and kill them one by one when they least expect it. They have a fake ant head that splits open to reveal deadly weapons.
0dE9p TIL Ike Turner’s Rocket 88 is the first rock n roll song but considered obscure in history. The song's significance on white teenagers in 1951 was not large but it was a huge record on the black charts
v15pL TIL to prepare for the role of Mark Renton in Trainspotting; Ewan McGregor considered injecting heroin to better understand the character.