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TIL Boston has hidden poems on its sidewalks that are only visible when wet. When it rains, pedstrians are treated to the work of Langston Hughes and others.

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Z8BrD TIL the Moon drifts away from Earth at the same speed fingernails grow.
4kM1w TIL that in the late 18th/early 19th centuries, an explorer traveled over 90,000 kilometres (56,000 mi) across North America, and mapped 4.9 million square kilometres (1.9 million square miles) of the continent.
NXPPP TIL of Gacek the Cat, a chunky tuxedo cat who happens to be the highest rated tourist attraction in the town of Szczecin. Tourists from all around the world come to feed him snacks
wpQJ TIL In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.
xVeeB TIL that 70% isopropyl alcohol is more effective than higher concentrations