We use a natural field experiment to investigate the hypothesis that generosity is partly involuntary, by examining whether individuals tend to avoid opportunities to act generously. In Sweden, new recycling machines for bottles and cans with an option of donating the returned deposit to charity...

Despite their importance in community interactions, nonlethal indirect effects of predators are not well understood in many marine food webs. In this study, I found that within a guild of herbivorous sea urchins, small urchins (Strongylocentrotus droebachiensis and small Strongylocentrotus...