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Plus: Scientists find new clues to chronic fatigue syndrome.

Our most-read science stories this week contain a few timeless life lessons. One, don’t go into an MRI room carrying metal, particularly if that metal is a loaded gun. Two, don’t cross a killer whale, even if you’re a great white shark. And finally, never judge a sea cucumber by its cover—no matter how repulsive that cover appears to be. - Rose Pastore