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100

TIL that colored goldfish are colored with different types of vegetables not food dye

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GNW4 TIL Dennis Rader, the “BTK” killer, contacted police and asked “Can I communicate with Floppy and not be traced to computer? Be honest.” Police told him he could, and Rader sent them a disk. Forensic analysts then identified him through metadata from a deleted MS Word file the disk contained.
ANKYB TIL that Gregor Mendel (famous for his pea plant experiment in genetics) was taught physics and astronomy by Christian Doppler, who the Doppler effect in weather is named after, and Mendel founded the Austrian Meteorological Society.
wLbeY TIL Human sperm doesn’t wiggle as previously thought, it spins like a “playful otter”
e0dlD TIL that aluminium weighs more than concrete per volume (1m3)
gbn8 TIL that Reinhold Messner, the first man to summit Everest without oxygen, was also the first to summit all 14 8000m peaks, reaching those without oxygen as well