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92

TIL that Nixon extended the Vietnam War for political gain

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NjeN TIL squirrels do not use sense of smell to find the hundreds of locations where they stored nuts for winters, instead they rely on spatial memory to remember location of each nut. A feat possible because of significantly larger hippocampus in rodent species.
p8mnQ TIL that San Francisco's Golden Gate Bridge is not named for its color but for its location on the Golden Gate Strait. Its unusual reddish-orange color was a radical choice in the 1930s. It matched primer painted on some of the steel.
jNMGQ TIL in 1981 members of a U.S. nuclear semiotics team believed if the world ended, survivors 10,000 years in the future might not know what the radiation symbol means. So they proposed breeding bioluminescent cats that would glow when they came near radiation to serve as living indicators of danger.
R7AYw TIL about tetrachromacy, the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye.
XRbX TIL of the theory that in ‘Superman’ (1978), Superman doesn’t actually turn back time by litterally reversing the earth’s rotation. Instead, he himself travels to the past by flying faster than the speed of light, and the reversing earth is simply a visual metaphor for this.