The battery of tests given to a patient having a heart attack in a U.S. hospital adds up to a dose of radiation equivalent to 725 chest X-rays, researchers reported on Monday.

An advanced type of MRI scan may help doctors more accurately diagnose a severe form of endometriosis, researchers said on Tuesday.

When Congress passed a new energy law two years ago, obituaries were written for the incandescent light bulb. The law set tough efficiency standards, due to take effect in 2012, that no traditional incandescent bulb on the market could meet, and a century-old technology that helped create the modern world seemed to be doomed. But as it turns out, the obituaries were premature.