Why Knuckles Crack
A little MRI video seems to settle the decades-old debate about that loud pop of the joints: It's all about bubbles. But imagine an air bag inflating, not the bursting of a balloon.
natural sounds
Can You Hear Nature's Sounds?
Our lives are now so noisy that we're at risk of shutting out nature's beautiful sounds, a new study shows. Anthropologist Barbara J. King invites us to be still and listen to the world.