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To vocalize, animals create sound waves in their pipe-like vocal tracts. Shorter pipes produce higher-frequency sounds, so small animals like the cuddly koala should have high voices. [Koala sound.] Or not.

By Tom Doggett and Ayesha Rascoe WASHINGTON (Reuters) - The failure of the underwater blowout preventer that led to the massive BP oil spill in the Gulf of Mexico was caused by the inability of attached cutting devices to shear and seal the pipe of the leaking well, the U.S. government said on Wednesday.