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TIL polyester underpants can cause temporal infertillity in men and is an effective contraceptive

Read more pubmed.ncbi.nlm.nih.gov

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16arW TIL about a deep-sea fish called the stoplight loosejaw. It is so called because its lower jaw has no floor and it shines red light from photophores under its eyes, which it uses like headlights. Most deep-sea creatures can't detect it because no red light filters down to them from the sun.
aAXo TIL in 1486, Spanish mathematician Paolo Valmes was allegedly burned at the stake for claiming to have solved the quartic equation because it was a against the will of God “such a solution (is) inaccessible to human understanding”
epBmE TIL that the California St. Francis Dam disaster of 1928, a midnight-hour 120' wave that killed 431 sleeping people and wiped out giant sections of land more than 50 miles west to Ventura, was caused by the dam having been built on a fault zone (in addition to the dam's retention of water).
0y9M TIL that Americans consistently overestimate blacks and Hispanics’ share of the US population. They estimate on average that 33% are black and 29% Hispanic when the true figure is less than 13% for each.
wLGAM TIL ancient Egyptians didn't use Hieroglyphics as an everyday writing system. They reserved this for special functions. The Egyptians used two script-like writing systems called Hieratic and Demotic. This eventually became Coptic script.