If you have an aversion to wasps, it might help to know that the venom from one of them, Polybia paulista, offers new hope for cancer treatment. Natália Bueno Leite of São Paolo State University in Brazil and colleagues have found that a peptide in the venom, Polybia-MP1, targets cancer cells selectively while leaving normal ones alone. It acts specifically on an atypical lipid composition in cancer-cell membranes, making holes, which kill the cell. These holes form in seconds, and the general strategy of going after cancer cells based on this difference in lipid structure could form the basis for a completely new class of anticancer drugs.