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Which is the right way to write this classic expression?

Fact Lab

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Interesting fact:

You’re probably familiar with “ology” tagged onto the tail of scientific-type words, but do you know what the shortest possible “ology” is? Oology. And oology is the branch of ornithology studying bird eggs, nest and breeding behavior. If comes from the Greek word “oion” which means egg. The more you know.

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