By Ashley Welch, Scientific American Anyone who has ever devoured a triple-chocolate brownie after an intense workout knows how tempting it can be to indulge after behaving virtuously. A new study suggests, however, that we often apply this thought process to inappropriate scenarios, giving ourselves...

From Science Daily Imagine a runaway boxcar heading toward five people who can't escape its path. Now imagine you had the power to reroute the boxcar onto different tracks with only one person along that route. Would you do it? That's the moral dilemma posed by a team of Michigan State University...

By David Brooks, The New York Times The story of evolution, we have been told, is the story of the survival of the fittest. The strong eat the weak. The creatures that adapt to the environment pass on their selfish genes. Those that do not become extinct. In this telling, we humans are like all other...

3/9/11, Science Daily A polite act shows respect. But a new study of a common etiquette -- holding a door for someone -- suggests that courtesy may have a more practical, though unconscious, shared motivation: to reduce the work for those involved. The research, by Joseph P. Santamaria and David A. Rosenbaum...

By Peter Singer, in New Scientist The Enlightenment philosopher David Hume pointed out long ago that no combination of statements about what "is" the case could ever allow one to deduce what "ought" to be. After all, in deductive arguments, the truth of the conclusion is already contained...

By William Saletan | Slate "Is it OK to impregnate a 60-year-old woman? Should old women have babies? Until recently, this wasn't an issue. Nature exhausted your egg supply, and that was it. But technology has surmounted that problem. Now you can get in vitro fertilization, donor eggs, and womb...