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TIL that Earth is the most dense planet in the Solar System while Saturn, the least dense planet, has a density lower than water

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X0LA6 TIL that the first 35 NASA space shuttle astronauts were nicknamed TFNG. The official meaning was "Thirty-Five New Guys", but the real meaning was "The Fucking New Guy", military slang for newcomers to a unit.
X0O46 TIL: Suicides among Youth Drop During Summer and December Break When Schools are Closed.
wo6WW TIL that in 1959 the Omaha VA Hospital purchased a nuclear reactor for $154,000, it was in operation until 2001 when it was dismantled for security concerns following 9/11.
X0oP6 TIL that, for legal reasons, in the years near 1900, New York saloons served inedible sandwiches with alcohol.
e07OE TIL: Only one acorn in 10,000 will become an oak tree