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TIL: Fish can cough through their gills

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pYnm8 TIL Astronomer Rudolf Wolf only counted large sunspots that were clearly visible so observations can be consistent with older telescopes, even though his assistant noted that one can actually detect many more sunspots
xDmw TIL that the green iguana has a ‘third-eye’ called a parietial eye, in the middle of its forehead. This does not function in the same way as its two side eyes, but enables it to detect movement, especially from above, to help it avoid predators.
J1Lwm TIL whale oil was used in transmissions until its ban in 1972, when less than 1 million transmissions failed each year; without whale oil, yearly transmission failures became more than 8 million by 1975. This led to thousands of transmission shops opening across the USA in the late 1970s and ’80s
1a1lW TIL China has 7 coffee shops that are a blatant ripoffs of Starbucks, competing with actual Starbucks without any legal consequences.
nemPo TIL Pandas will sometimes fake pregnancies to receive more food and special treatment from humans