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Until I am measured, I am not ...

Until I am measured, I am not known. Yet how you miss me, When I have flown! What am I?

Correct answers: 80

The first user who solved this task is On On Lunarbasil.

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April Fool's Day - Moldy sandwich

Send your kid to school with a moldy sandwich. The sandwich is fine, of course. It’s the sandwich bag that has green markings on it.

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Weather kite

In 1898, the first Weather Bureau kite was launched from Topeka, Kansas, and by the end of the year, 16 additional kite stations were attempting daily, early morning, simultaneous observations. The kites were large "box types" with dimensions of 8 feet long, 7 feet wide and 3 feet high. As many as seven kites would be attached to the kite wire during and observation. These kites were placed at regular intervals with the second 1500 feet behind the first, the third 2000 feet behind the second and from there on a spacing of 2500 feet.

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