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TIL Apollo 17 geologist astronaut Harrison Schmitt served in the U.S. Senate, becoming the only "natural scientist" in the Senate since Thomas Jefferson was Vice-President. Schmitt presently is Adjunct Professor of Engineering, University of Wisconsin-Madison, teaching "Resources from Space"

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via reddit.com

OoBkY TIL James Harrison has donated blood every week for the last 60 years. His blood contains a rare antibody that prevents pregnant women from developing Rhesus Disease. With his donations, he has saved over 2 million lives.
DVpj TIL that some homosexual concentration camp prisoners were forced to serve out the remainder of their sentences after liberation and end of WW2
x6e6b TIL the Library of Congress has a “free to use and reuse” section featuring millions of photos, books, films, and sound recordings that are either in the public domain, have no known copyright, or have been cleared by the copyright owner for public use.
7rNM TIL that a University of California physics professor wrote a mathematical proof paper to get out of a speeding ticket…and did!
5gPP TIL that after water, concrete is the most used substance in the world.