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TIL the Bobtail squid, a nocturnal animal, has a light organ on its underside that contains light emitting bacteria that help the squid camouflage its silhouette that would otherwise be visible to predators swimming below during a moonlit or starlit night.

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9Y64Q TIL long before trees overtook the land, Earth was covered by giant mushrooms
xoXB TIL there exists a common, popular belief in Japan and other East Asian countries that a person’s ABO blood type is considered an indicator of personality type. So much so that sometimes schools and employers will discriminate students and prospective employees based on it.
e6kE TIL that once the Babylonians could predict when solar eclipses would occur, they would install a substitute king during this period. As they believed that these eclipses were an evil omen, this substitute king could be blamed. (He usually was killed after - of course making the omen true.)
b9P69 TIL that between 1968-99, Black, Latinx, and Asian American UC students led multiple strikes on campus to demand ethnic studies courses, fair admission practices, and scholarships for POCs.
b9xN9 TIL that despite being a huge and popular music icon for several decades, Prince was only 5'2" (158 cm) in height.