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TIL that horseshoe crab blood, costing $60,000 per gallon, is unique and is integral in FDA testing. This has led to a massive effort by scientists to try to conserve this invaluable resource.

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VBYY4 TIL That part of the CIA's Memorial Wall is the Book of Honor which identifies agents who have died in the field. However, as of 2021, 37 of the 137 entries in the book have no names as the identities remain classified even decades later.
KYMgG TIL the the color "mummy brown" was made from ground up Egyptian mummies. This was true up until the mid 20th century.
OWAa TIL One of the major objectives of the French Revolution was to switch all measures of time from base 12 to base 10, including a ten day week. Ironically, the experiment lasted 12 years.
0wlXj TIL the US actually has a higher suicide rate than Japan.
5Yldk TIL the ancient city of Gobekli Tepe in Turkey was built ca. 10,000 BC, is twice as old as Stonehenge, and completely disrupts our ideas of human development and agriculture.