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TIL of Siren Kings, a youth subculture where crews try to build the loudest and clearest sound system. The "sirens" are a mix of battery-powered loudspeakers and public address systems fixed to cars or bikes. Celine Dion's music is often used in Siren battles as they must showcase treble over bass.

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pY6nA TIL that there is a specific bark of a male cheetah that causes females to ovulate.
wLk71 TIL that lemurs use a certain kind of millipede to get high. The millipedes also act as a kind of insect repellent too, keeping mosquitos away from the lemurs for a bit
4DAX TIL Singapore is the only country in the history of the modern world to gain independence against its own will.
Z8ZD TIL Bush’s African Aids program spends 2/3 of the money on abstinence only programs, will only give condoms to “high risk” groups, won’t support clean needles and while saving lives it could have saved millions more.
d865K TIL that even a gentle human voice is enough to make apex predators such as mountain lions flee in terror