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TIL As opposed to having XY chromosomes (found in mammals), birds, some fish, crustaceans, and insects have ZW system, where males typically have ZZ and female ZW chromosomes.

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1aNEr TIL the most abundant vertebrate genus in the world is not chickens but probably the bristlemouth fish numbering in maybe quadrillions of members. Basically these tiny fish are everywhere deep in the ocean and even gave strange false bottom readings by sensors of ocean depths when first discovered.
gM6yD TIL the difference between sushi-grade salmon and regular store-bought salmon is that Sushi-grade is “super frozen” to about -40C to kill off parasitic worms and bacteria, keeping it fresh and relatively safe to eat raw. If you eat raw store-bought salmon...you will more than likely get sick.
eVrn TIL In late 1918, A British Soldier Serving in France encountered a wounded German Corporal in No Mans Land, and raised his rifle to shoot him. The two men caught eyes, and nodded, than the British Private lowered his rifle, and let the German go. That German soldier was Adolf Hitler.
VKem TIL in 1700 India’s economy had a 24.4% share of world income, the largest in the world after which it steadily declined under the British Raj (Empire) until in 1952, it was only 3.8%.
VZLB TIL there’s a team of NASA scientists who’ve been pretending they’re on Mars for nearly a year. They live and work in a dome on the side of a Hawaiian volcano and only go out in spacesuits.