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129

TIL that every Texas ranger’s badge is made from Mexican silver

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by4N TIL Bausch & Lomb packaged identical lenses under 4 different brands with different pricing, charging $3 to $70 per pair depending on how often the lenses would be replaced. They also repackaged lens cleaning solution (23¢ per ounce) as eye drops, which sold for $4.49 per ounce.
b9ZLa TIL China has an annual holiday known as Tomb Sweeping Day, when citizens visit the graves of their ancestors to leave tributes and burn incense. There are many rules about how to do this respectfully including not driving your car to the grave, and not attempting to summon ghosts.
joAE TIL that in 1847, when anaesthetic was used for the first time in childbirth, the mother was so amazed and relieved at how painless the birth was that she named her child Anaesthesia.
PDwG TIL a state license to be an EMT in Louisiana requires 41 days of training. Manicurist: 117 days. Barber: 350. Vet tech: 730. Most days of training required: 2,190 days to be an interior designer.
LkMAv TIL the reason seals, whales, and other diving mammals can hold their breath for so much longer than non-diving mammals is because they have a special type of myoglobin (oxygen-biding protein) that is positively-charged, preventing disease-causing clumping (like tau in Alzheimer’s).