Anxiety-Drug Pollution Leaves Swedish Fish Greedy and Fearless

Anxiety-Drug Pollution Leaves Swedish Fish Greedy and Fearless

The researchers exposed wild European perch to similar levels of the anti-anxiety medicine oxazepam - a commonly prescribed benzodiazepine, a class of tranquilizers that includes Xanax and Valium - as those found in a Swedish river. Photo: BSIP/UIG via Getty Images