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TIL there is only one non-terrestrial geocache in existence, placed by Richard Garriott on the ISS in 2008.

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VBkgk TIL Spc. Sean Baker was nearly beaten to death during a training exercise at Gitmo where he played the role of a detainee. Despite using the codeword and identifying himself, the beating only stopped when his jumpsuit ripped revealing fatigues
VBoY8 TIL about long-term nuclear waste warning messages, designed to warn civilizations ~10,000+ years in the future of the dangers of nuclear waste sites. Proposed solutions include an atomic priesthood to perpetuate rituals and myths, and cats genetically modified to change color when irradiated.
PYDkJ TIL Vegemite, a food spread made of leftover brewery yeast, was banned in some Australian prisons to prevent inmates from making moonshine. Also, because Vegemite's high concentration of ions and water can be used to conduct electricity, it's currently being researched to make edible medical sensors
VBdMm TIL our brain suffers from the mere proximity of our smartphone: The "brain drain" hypothesis suggests that just having our smartphone nearby can use up some of our mental resources, leaving us with less ability to focus on other tasks.
m1l7p TIL that rhinoplasty surgeries date back to the sixth century B.C. in India. An Indian physician named Sushruta documented instructions in the Sushruta Samhita for performing scores of surgical procedures – including three types of skin grafts and reconstruction of the nose.