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TIL: of Star Jelly, a translucent jelly-like substance that has been found for centuries. Scientists have no idea what it is. According to folklore, it is deposited on the Earth during meteor showers.

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9YwgD TIL Turtles have bizarre skeletons
KOQk6 TIL The Underground Railroad ran slaves not only to Canada and Northern states but also to Mexico
dDl9 TIL insects do not experience pain because they lack nociceptors. Crustaceans are suspected to feel pain, however no nociceptors are present in their anatomy.
oBQBY TIL in 1996, NASA established the Breakthrough Propulsion Physics program in order to research propulsion that requires no propellant mass. Topics of interest include experiments and theories regarding gravity and electromagnetism, vacuum energy, warp drives and worm-holes and quantum effects.
p8X48 TIL The phrase "mad as a hatter" originated in the hat making industry of the 18th century as mercury nitrate was a vital substance used in the production process. This lead to a variety of physical and mental ailments, including tremors (“hatter’s shakes”), speech problems, emotional instabilities.