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Dog noses are so sensitive, that…

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Dog noses are so sensitive, that besides able to smell various chemicals in water, dogs can also sense whether someone is an accountant or a butcher.
Dogs have also been used at conclusion of SAT tests to smell out which college major a student should apply. Beagles are the most accurate, while Chihuahuas are the least accurate, always predicting future hockey players.
Another Fun fact from Mr. Science.

Medieval dentures

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During Medieval times dentures were made of corn kernels. The wealthy could afford yellow corn, while the poor had to settle for multicolored maize.
Consequently, hot foods affected the dentures. And that’s how popcorn was discovered.
Another Fun Fact from Mr. Science.