Anna Dornhaus, a University of Arizona researcher, painted ants different colors to study them. Great differences were found in the speed of ants’ work, and about 50 percent were found to do no work. — NT Times

Anna Dornhaus, a University of Arizona researcher, painted ants different colors to study them. Great differences were found in the speed of ants’ work, and about 50 percent were found to do no work. — NT Times

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