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TIL why Roman concrete often lasted thousands of years, but ours decays in mere decades.

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4446 TIL Twins conjoined at the head can possibly share sensory experiences and conscious thoughts.
JYd5B TIL that McDonalds has a Gold Card that entitles the holder to free, unlimited food. Warren Buffet and Bill Gates have one, as does Charles Ramsey, who ditched his half-eaten Big Mac to help rescue three kidnapped women.
GYmn4 TIL P. Terry’s Burger chain in Austin has a full time employee whose job is to bake birthday cakes for employees.
6Ed0Q TIL anybody travelling on the International Space Station needs to have both metric and imperial tools with them. This is because the American portion has been built in 'imperial' and the rest in metric.
yQ5m8 TIL that in 1993, the Pantai Remis landslide occurred in Malaysia, where a massive tin mine collapsed, generating what one academic has described as “the best landslide video ever seen” despite the bad resolution.