Can our evolutionary roots explain that self-destructive search for sex – and sexual companionship? Could Darwinian psychology constitute the cause home-wrecking, career-blitzing fatal attractions?

The Why Files asks why mass killers pull the trigger. What are the warning signs of “rampage” shootings? Can they be prevented?

Study finds that male body odor is harder to mask, but the male nose is more easily confused. Info lends insight into human mating, and helps perfume makers. So what’s in your deodorant?

We explore the sad saga of pet primates. Are these pets psychologically good for us? For them? Are humans and other primates trading diseases at home, and in the wild?

Disgust caused by filthy food, feces, and an unfair deal all trigger the same facial expression. So is our moral disgust the same as the primitive disgust caused by toxic food?

Researchers in positive psychology find that giving is better than receiving, that social relationships are key, and that money can – in some circumstances – buy some happiness.

Study finds that holding a warm cup of coffee for a few seconds can make us see other people as warmer, more outgoing. How come?

Are you undecided about the presidential race? A new test shows that it ain’t necessarily so. You may have made your decision — but don’t yet know it.

Depression causes more disability than diabetes, cancer or stroke. What causes depression? How is it treated? Can we improve treatment?

New analysis of post-traumatic stress disorder among American Vietnam vets find 19 percent had PTSD after serving in combat. The greater the exposure to combat, the higher the rate of PTSD.