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TIL Ancient Egyptians used to bury Sacred Bulls in 60+ tonne sarcophagi, two dozen of them remain in the Serapeum of Saqqara

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nJGG TIL the Great Pyramid of Giza was once covered in highly polished white limestone, before it was removed to build mosques and fortresses.
jNd7M TIL that the IRS and the USPS both have a plan in place in case of a nuclear war. The IRS has an employee handbook called the "Internal Revenue Manual" that details how to collect taxes after the nukes. The USPS will continue delivering mail and has 60 million change-of-adress forms prepared.
xVrE1 TIL that the flag of West Virginia is the only US State flag with crossed rifles, meant to illustrate the importance of the state's fight for liberty during the Civil War.
W7gjX TIL Space Poop Challenge, a 2016 contest sponsored by NASA for new designs of space toilet systems for use in space suits, requesting "proposed solutions for fecal, urine, and menstrual management systems to be used in the crew’s launch and entry suits over a continuous duration of up to 144 hours".
PYGvw TIL that the superb fairywren is a socially monogamous but sexually promiscuous bird. Couples stick together, but each member mates with other fairywrens. Coupled birds later help each other to raise the resulting "illegitimate" offspring.