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TIL microscopic algae, not trees, produce the majority of the oxygen we breathe.

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L9rr TIL that your probability of earning more than your parents in the US has progressively dropped since 1940
Wk754 TIL that the Earth casts its shadow onto the atmosphere. It is visible during twilight as a blue or purple band just above the horizon.
loeoa TIL that in 1996 the boxing career of former heavyweight boxing champion Tommy Morrison ended when he tested positive for HIV. However, in 2007 two nationally renowned HIV experts retained by the NY Times concluded that the 1996 result had been a false positive.
LkENp TIL bees can affect the electric charge of a flower, which tells other bees that the flower is currently out of nectar. The hairs on their body can sense the negative electric charge and lets them know they shouldn't waste their time stopping by.
X0pgX TIL That Terry Pratchett changed German publishers because Heyne inserted a soup advert into the text of one of his novels and wouldn't promise not to do it again.