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TIL The Judy Bolton books 1932-1967 by Margaret Sutton is the longest-lasting juvenile mystery series written by an individual author

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Menl0 TIL of the "Brown Ocean Effect", wherein tropical cyclones maintain their strength of even intensify after making landfall. Tropical Storm Erin (2007) and Bill (2015) both exhibited characteristics of this phenomenon.
kR5E TIL: of the foldscope. A microscope that provides magnification from 140X to 2,000X. It is assembled from a punched sheet of cardstock, a spherical glass lens, a light emitting diode and a diffuser panel, along with a watch battery. It is designed to cost less than US$1 to build.
xV9QB TIL: Mangos are in the same family as poison ivy, so if you are sensitive to poison ivy, the skin of a mango is likely to affect you too.
gAW TIL Spongebob Squarepants is 26 years old today.
P18Be TIL In 1969 Colorado tried fracking with a nuclear bomb - it worked, but the oil and gas are too irradiated to be used even today