Researchers first became aware of the marbled crayfish when a German aquarium owner contacted them in 1995 after a bag of "Texas crayfish" took over his aquarium, the Atlantic reports. The crayfish, dubbed Marmorkreb in German, turned out to be parthenogenetic clones of one another and have since been found in the wild in Germany, Italy, Slovakia, Sweden, Japan, and Madagascar, it adds.

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In a statement, National Institutes of Health Director Francis Collins says sexual harassment is "morally indefensible" and "unacceptable."

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