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I have a single waving hand ...

I have a single waving hand I'm present in places across the land On fairer days, I depart I shorten with a broken heart. What am I?

Correct answers: 38

The first user who solved this task is Djordje Timotijevic.

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Post Office

A blonde goes to the post office to buy stamps for her Christmas cards. She says to the clerk, "May I have 50 Christmas stamps?"
The clerk says, "What denomination?"
The woman says, "God help us. Has it come to this? Give me 6 Catholic, 12 Presbyterian, 10 Lutheran and 22 Baptists."

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Arthur Jeffrey Dempster

Born 14 Aug 1886; died 11 Mar 1950 at age 63.Canadian-American physicist who in 1918 built the first mass spectrometer (based on the invention of Francis W. Aston) and discovered isotope uranium-235 (1935). The mass spectrometer is an instrument that uses electric and magnetic fields to separate and measure a sample's atoms according to their mass and relative quantity. In 1935, he discovered that naturally occurring uranium, though mostly uranium-238, contained 0.7% U-235 (later used as the primary fuel in atomic bombs and reactors after Niels Bohr predicted it could be used to produce a chain reaction releasing huge amounts of nuclear fission energy). During WW II, Dempster worked with the secret Manhattan Project that developed the world's first nuclear weapons.«

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