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TIL that Skinner, the psychologist responsible for operant conditioning (training animals using reward and punishment), also tried to help the WWII war effort by training pigeons to help guide missiles

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P1nVO TIL you can have a negative magnitude earthquake. Magnitude calcs are based on logarithmic scale so a ten-fold drop in amplitude decreases the magnitude by 1. If an amplitude of 20 mm as measured on seismic signal corresponds to a magnitude 2 earthquake then 1000 times less (0.02 mm) is mag -1.
wLpRY TIL that QWERTY keyboards were invented to prevent typewriters from jamming. Following its invention, the Dvorak keyboard was introduced and was said to improve typing speed by 5-10% but still is not widely used.
XRnQ TIL: The National Federation of the Blind has a program where Santa will mail braille letters to children who are blind. Parents have until December 16th to request a braille letter from Santa.
0Zdv TIL- Doctor ignaz discovered that by washing his hands between delivering babys cut the mortality rate of infection from 35% to less than 1%. His ideas were rejected by the medical community and upset other doctors so much they put him in a insane asylum. He was beaten to death 14 days later
PYjyE TIL (US-Style) Biscuits are generally of a better quality in the South because they require soft-wheat, which is grown and sold in the South almost exclusively. Soft wheat is better for biscuits but worse for bread - the opposite is true for the hard wheat of the North and West of the US.