With sadism and masochism no longer seen as inherently pathological, scientists have begun to think about these as traits that everyone might possess (at least a little bit). In “Why We Hunger for Hurt,” we’ll take a look at research that links masochism to eating chili peppers, riding roller coasters, and climbing mountains, and sadism to Internet trolling and delivering noise blasts in a laboratory game. We’ll also explore whether these types of “everyday sadism" have anything to do with the consensual sadism we see in the BDSM community.