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TIL that there is a string called an "eruv" encircling most American cities, including almost all of Manhattan, strung from pole to pole. The one in Manhattan costs $100k / year to maintain.

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1RAd TIL that the year 1816 was referred to as the “Year Without a Summer” due to global cooling from a volcano eruption the year before. Snow fell in July and the Northeast U.S. was enveloped in an orange fog.
Aexw TIL - Heinz ketchup has the number 57 on it just because H.J. Heinz thought it was luckier than 60 which was the number of varieties of their products at the time.
5YGmP TIL Berlin redrew its district borders because of an old man’s garden
kOEn7 There's an extremely rare metallic asteroid lurking between Mars and Jupiter, and it's worth more than the entire global economy. Now, the Hubble Space Telescope has given us a closer look at the object, which is worth an estimated $10,000 quadrillion. — that's a one followed by 19 zeroes.
LkeVd TIL Japan's average elevation is actually quite low, despite the popular perception of Japan being covered in hills and mountains.