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TIL A jew’s harp is a single reed instrument of an Asian origin and has nothing to do with the Jewish culture. The reed produces a fundamental note, other notes produced by a player by altering the shape of mouth using tongue.

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e01Vb TIL The Moon has an atmosphere, although it is so thin that scientists consider it basically nonexistent for practical purposes. The total mass of the lunar atmosphere is about the same as a school bus.
QJ74k TIL that the US government uses a cartoon turtle to teach kids how to hide under their desks to survive a nuclear bomb attack.
e6yb TIL that Leonardo da Vinci often purchased caged birds so that he could set them free immediately.
Lk4QP TIL The United States Constitution lists issuing letters of marque and reprisal as one of the enumerated powers of Congress. These letters authorize a private person, known as a privateer, to attack and capture vessels of a nation at war with the issuer. Congress can make you a pirate.
dDLGB TIL that lightbulbs in the NYC subway and other train systems have left-hand screws. The backwards design is to prevent people from stealing bulbs for use at home.