New 3D Images Let Doctors See What Causes an Irregular Heartbeat [Medicine]

A healthy heart beats evenly as a metronome, sending oxygen-rich blood to your organs and appendages. But if your ticker's rhythm isn't so even, it can lead to fibrillation—rapid, unsynchronized contraction of the muscles that impedes the delivery of blood around the body. More »

zombie apocalypse matt moore matt moore national grid