Jiahu bone flutes early playable multinote instruments

Jiahu's bone flutes played several notes

The bone flutes found at Jiahu, a site in central Henan, China, date to 7,000–9,000 years ago. They are among the earliest known complete, playable, securely dated instruments capable of producing multiple notes.

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Evaporation can chill below room temperature

7°F in a 65°F room

In Benjamin Franklin’s experiments with wet ether, a thermometer cooled to 7°F while the room remained at 65°F. The result showed that evaporation can cool an object far below the temperature of the surrounding air.

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Morocco has America's oldest unbroken friendship treaty

Morocco recognized the fledgling United States as independent in 1777. The two countries signed their Treaty of Friendship in 1786, and it remains the United States’ oldest unbroken friendship treaty.

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