When mice encounter an unfamiliar food, neurons in a brain region called the amygdala light up (blue). If the mice start feeling sick after the meal, the same neurons get reinforced to help the mouse ...

Puppies with a good grasp of basic gestures, self-confidence and impulse control grow into well-behaved adults, a new study suggests.

Across much of the world, loneliness increases from middle age to later years. That trend is reversed in the United States, a new study shows.