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TIL In the 4th and 5th century BC, Hippocrates was the first to document the heart as a muscle. He described it as pure dark red and pyramidal or spherical, with a liquid film surrounding it to reduce friction

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7r8Qr TIL Earlier this year, analysis showed that Subway 'chicken' was about 1/2 chicken, 1/2 soy mush.
grOEy TIL The Hale telescope features a 200 inch (5.08m) diameter mirror. The mirror took 10 months anneal and was delivered to Caltech in 1936. The telescope was completed in 1948 as it took years of grinding and polishing to make the mirror accurate to 2/1,000,000ths of an inch of a perfect paraboloid.
l7E5A TIL that like most British colonies, Canada used to drive on the left side of the road. They abondonded this in the 1920s to facilitate traffic to and from the United States
0Kav TIL Airport runway numbers actually indicate direction on a compass
awweJ TIL McDonnell Douglas (now Boeing) was working on the reusable rocket in the 90's