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TIL when the Apollo 13 Saturn IVB upper stage impacted the Moon, the impact was picked up by seismometers put in place during Apollo 12.

Read more nasa.gov

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4Xyyo TIL that a study from 2016 identified an overall 57% diminution in mean sperm concentration over the past 35 years in North America, Europe, Asia and Africa. Reports in South America indicated no significant alteration. An increasing trend of sperm concentration was identified only in Australia.
wLgpE TIL: The Oval Office's current desk, a gift from Queen Victoria, was modified by FDR who had a carved front panel added to hide his leg braces. It has also been raised with a base because presidents from JFK to Reagan kept banging their knees against the underside.
b9kQ0 TIL that in 1973 the Irish Republican Army (IRA) hijacked a helicopter, flew to Mountjoy Prison in Dublin, landed in the exercise yard and helped three volunteers escape. It was dubbed 'the escape of the century' and made headlines around the world
6EL5J TIL The Beatles song 'Mean Mr. Mustard' was inspired by a Scotsman, John Mustard, who gave his wife only £1 in the year before they parted. Lennon read about in the Daily Mirror on June 7th 1967.
MKn8 TIL When identical twins procreate with another set of identical twins, their offspring are both genetic siblings and social cousins