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TIL that in 2001 Argentina had 5 presidents in 2 weeks.

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VBGdD TIL: The federal government is by far the largest employer of veterans in the United States
9wp5X TIL in 1963 Popular Science magazine advocate an efficient way to dispose of used motor oil, by using a hole filled with gravel. The oil "will be absorbed into the ground before your next (oil) change".
1aggW TIL Lifesavers, and other forms of crystalline sugar - Produce lightning like sparks when chewed vigorously. This effect can be reproduced in any dark environment, and is called Triboluminescence.
kO0em TIL that the Chinese equivalent of "when pigs fly" is "when the sun rises in the West." Other variants include "when the crayfish whistles" (Russian), "when the crow turns white" (Tagalog), "when the fish climbs the poplar" (Turkish), and "when it snows red snowflakes" (Hungarian).
5A09 TIL a US PAN satellite was launched in September 2009 and is so top-secret that no military or governmental organization claimed to have built it.