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TIL there exist humans with four cones in their eyes (tetrachromats) that can perceive color differences the rest of us cannot. Because it is based on a gene variation of the X chromosome, it is believed that only women can be tetrachromats.

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kOBY7 TIL That the title of System of a Down’s “Chop Suey”, is word play derived from the original title of the song “Suicide”, and making it more radio friendly by litterally “chopping” the word “sui-cide”, thus the title “Chop Suey”.
XymX TIL that during a speech to senators intended to convince them that the dust bowl epidemic was a real issue, a massive dust cloud enveloped Washington DC, blackening the windows of the hearing and caking the room with dust. The Soil Conservation Act was passed later that year.
167bO TIL in 1949, eight observers documented every word and movement of a seven-year-old boy from rural Kansas for a sociological study
b6ky7 TIL that about 30 scientists and staff of the Pavlovsk Experimental Station starved to death guarding the institute's edible seeds and plants during the siege of Leningrad
KML9 TIL: Like many deep-sea cephalopods, vampire squid lack ink sacs. If threatened, instead of ink, a sticky cloud of bioluminescent mucus containing innumerable orbs of blue light is ejected from the arm tips.