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TIL: The first quantitative estimate of the speed of light was done in 1676 by timing eclipses of Jupiter's Io.

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aw6l9 TIL of 52 Hertz-the loneliest whale on our planet. It roams the world's deepest oceans looking for a mate but it's unable to find one because no other whale is capable of understanding it's 52 Hertz call.
nWrgr TIL in 1990 an 8 year old girl with cerebral palsy named Jennifer Keelan left her wheelchair and crawled up the steps of the U.S. Capitol Building to urge Congress to pass the Americans with Disabilities Act which had been stalled in committee. It was signed into law a few months later.
Z8JNQ TIL the large house that Forrest Gump lives in was built entirely for the movie. After filming finished, the house had to be knocked down as it didn't meet building regulations. The drive leading to the house (run Forrest run) is still there and has barely changed.
v1W04 TIL According to the United States Department of Treasury, an estimated $200 million in counterfeit bills are in circulation, or approximately 1 note in counterfeits for every 4,000 in genuine currency.
oj9r TIL that “Human and Animal blood” make up 1.3% of total US exports. Exports of blood bring in $18.9 billion of revenue.