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TIL the Bagworm Moth Caterpillar is one of the rare architects of the animal world. They construct miniature “log cabins” by collecting little twigs and building them into tiny protective houses which they live in! Some constructions look similar to a strand of DNA.

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v1byr TIL of the sitcom pilot, "Where's Rodney" which aired once as a burn off during the summer on NBC in 1990, and was about a kid who can magically summon Rodney Dangerfield to give him advice.
VMpEZ TIL peeling Scotch Tape in a vacuum releases enough X-rays to produce an image of finger bones on X-ray film
0wQEy TIL that a research suggests that humans fear cockroaches the most, even more than mosquitoes, due to an evolutionary aversion.
VbN4 TIL of the “Sisyphus Train,” a project currently underway in Nevada meant to recover surplus grid power that can’t be stored very easily. During the day, the excess power is used to drive the train up a hill. At night, the train rolls back down, generating it all back again.
aw6Ao TIL there is a species of butterfly that feeds only on specific plant (Artemisia Vulgaris), which happens to like soil above mass graves. Forensic teams followed blue butterflies to help them uncover the mass grave sites.