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TIL that the average density of the Earth is almost four times greater than the average density of the Sun

Read more nssdc.gsfc.nasa.gov

via reddit.com

X05Kr TIL Magenta isn't a real color. Turns out its just a placeholder that your brain uses when it gets a mixture of Red and Blue light without any Green light
v1mEr TIL that the "Johns" in Johns Hopkins was originally a last name, not a first name: "Johns Hopkins' peculiar first name was simply a family affair; it had been his great-grandmother's maiden name."
nePyo TIL that laid end to end, an adult’s blood vessels could circle Earth’s equator four times!
ANAgo TIL one possible origin to the idiom, "shake a leg", meaning to 'get going' or 'hurry it up' came after battles during the Civil War. Stretcher-bearers would violently jostle a leg or arm to elicit a response from victims on the field to determine if he were alive or dead.
oRr8R TIL: Sigmund Freud's nephew, Edward Bernays, pioneered the field of public relations. Applying his uncle's ideas, Bernays convinced the public that bacon and eggs was the all-American breakfast and, using subliminal images of vaginas and venereal disease, that only disposable cups were sanitary.