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TIL If a Helicopter’s engines fail midair they use a state of flight called ‘autorotate’, which allows them to land safely. This system uses air going up towards the main rotors as the chopper is falling; causing the main rotors to spin and generate enough lift for a controlled emergency descent.

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N75Re TIL that a Magic the Gathering card, Black Lotus, sold for $87,000
VBBL8 TIL of the use of "Trap Crops", secondary crops planted with the purpose of blocking or diverting insects/parasites off the main crop. In some cases, even decoys made of plastic or carboard can be helpful to disrupt insects.
N7Rbe TIL that John Leguizamo turned down the role of Tom Hanks' Lover In 'Philadelphia' so he could play Luigi in 'Super Mario Bros'
gMpM9 TIL about John Britten. He and his small team built a motorcycle out of his garage that would defeat major manufacturers like Honda and Ducati at major races as well as break several world records. He designed and fabricated almost every component from scratch.
o6A8 TIL that John Horwood, a stalker convicted of murdering a young woman in 1821, was sentenced to dissection by a court in Bristol, UK. A surgeon peeled and consequently tanned his skin and made it into a book called “the skin of John Horwood”, recording his findings within.