A new genetic engineering technology could help eliminate malaria and stave off extinctions — if humanity decides to unleash it.

New research on children’s behavior.

The idea that a young child could have psychopathic tendencies remains controversial among psychologists. Laurence Steinberg, a psychologist at Temple University, has argued that psychopathy, like other personality disorders, is almost impossible to diagnose accurately in children, or even in teenagers — both because their brains are still developing and because normal behavior at these ages can be misinterpreted as psychopathic.

On champ-turned-coach Alberto Salazar and the New York City Marathon.

A profile of Jaron Lanier, virtual reality pioneer and the author of You Are Not a Gadget: A Manifesto.