We choose between alternatives without being fully informed about the rewards from different courses of action. In making our decisions, we use our own past experience and the experience of others. So the ways in which we interact - our social network - can influence our choices. These choices...

The parasitoid wasp, Hyposoter horticola, parasitizes a nearly fixed fraction of its host butterfly larvae within a host metapopulation of 300--500 local populations in a 50 × 70-km area. We show, through laboratory observation, that the wasp lays eggs in fully developed larvae that have not...