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They were used to warn people of impending attacks of bombers. Today they are used for tonados and other disaters.
1941
1950
Hitler started it
To warn people of bombs falling.
Oliver Warn is 6' 2".
Probably, "Leave the City, NOW!"
Harry S Truman did NOT start World War 2.
He DID warn them, but they wouldn't listen.
Japan
in 1969
World War 2 was started in 1939
That he's not the luckiest guy in the world.
No, anacondas do not warn their prey, if they warned their prey that would give them a head start, the predator will always try to get their meal as easy and quick as possible.
1939
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