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The first open scuba equipment. Developed by Emile Gagnan and Jacques Cousteau.

Aqualung is the title of an album by rock band Jethro Tull, who had not at the time realised the word was a trademark.

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Quadratic formula

... the square" is to add a constant (i.e., in this case, a quantity that does not depend on x) to the expression to the left of "=", that will make it a perfect square ...

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