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TIL it is the sperm that determines the sex of the baby prior to conception. The egg is always an X chromosome, if the sperm is X the baby is female (XX), if the sperm is Y the baby is male (XY)

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7r15Z TIL performance artists Teching Hsieh & Linda Montano spent one year tied to each other at the waist with an 8-foot-long rope. They had to stay in the same room while indoors (including at Montano's teaching job); and they were not allowed to touch each other until the end of the one-year period.
MeV57 TIL as of 2016, Giant Pandas are no longer classified as an endangered species.
mxyxR TIL that one of the attempts to find El Dorado, the mythical city of gold, involved draining a lake using a bucket chain of laborers. Over three months, the lake level fell 3 meters and only recovered about $100K worth of gold.
VPMG TIL that the brightest supernova we have ever witnessed had a kill radius of 500-1000 light years, meaning it would have sterilized millions of habitable planets.
WkvBX TIL scientists trained bumblebees to pull strings for food; they pulled strings to bring discs with sugar water out from under a plastic sheet. Over 60% of other bees watching behind a clear wall knew to pull the string when it was their turn.