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TIL the scent of Play-doh has been trademarked. Hasbro describes it as “sweet, slightly musky, vanilla fragrance, with slight overtones of cherry, combined with the smell of a salted, wheat-based dough.”

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pYogG TIL that Alfred Hitchcock had cameo appearances in nearly all of his films
rNapM Today I learned that Italy is the country with the most sites on the World Heritage Site list, with 58 areas. China comes in second place, with 56 protected sites, followed by Germany, with 51 sites.
e0kMJ TIL Edgar Allen Poe once wrote a love letter to the dash, a form of punctuation he felt was unfairly demonized.
VMEem The atomic clocks that mark official time lose the equivalent of just 1 second every 200 million years. But metrologists are not satisfied.
695rQ TIL That the US has policy that makes the metric system the official system.