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TIL in 2020 global human-made mass exceeded all living biomass

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rROAW TIL of the bald-hairy joke, which states that Russian leaders have been alternately bald and not bald (hairy) since 1825. For example, Lenin (bald) was succeeded by Stalin (hairy), who in turn was succeeded by Khrushchev (bald), then Brezhnev (hairy)
kO5De TIL the US military uses dolphins to find and identify underwater mines because they are better at it than humans.
y4bw TIL that one of Palau’s 16 states has 3 residents and 3 official languages
5B7P TIL one of the checks which a British nuclear submarine makes to see whether the government is still functioning is whether BBC Radio 4 is broadcasting.
d1EZ TIL of the Steller’s sea cow. At up to thirty feet long, it was one of the largest mammals to have ever lived. It was famous among sailors because its meat was reportedly delicious and lasted for months without spoiling. Within twenty seven years of its discovery, it was hunted to extinction.