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...

By Katherine Harmon | Scientific American "If love is said to come from the heart, what about hate? Along with music, religion, irony and a host of other complex concepts, researchers are on the hunt for the neurological underpinnings of hatred. Functional magnetic resonance imaging (fMRI) has begun...

By Jan Dönges | Scientific American "No one doubts that the words we write or speak are an expression of our inner thoughts and personalities. But beyond the meaningful content of language, a wealth of unique insights into an author’s mind are hidden in the style of a text—in such elements as how...

By Veronique Greenwood "In a famous set of experiments in the 1970s, children were observed trick-or-treating in the suburbs. Some were asked their names and addresses upon arriving at a door, while some were asked nothing. All were instructed to take just one piece of candy from the bowl, but as...