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Scientists have published thousands of studies using immortal cell lines, but in many cases the cells in the experiments have been misidentified or contaminated. The problem could be avoided easily.

A new study finds that too little sleep boosts a signal in the body that may drive a stronger desire to eat. It's the latest evidence linking sleep deprivation to overeating and increased body weight.

The pipeline's fate looms large in Washington. But for people living in Keystone XL's proposed path, the project will alter livelihoods and legacies — for better or worse, depending on whom you ask.

Aftershocks are rattling survivors' nerves and making the recovery even more challenging. In one district, 400,000 people were affected by the quake and more than 4,000 homes are now unsafe.

Said one observer, "Some sitting members of Congress woke up the next morning after these maps had been released and went, 'Oh, boy, I don't even live in the district now.' "

The World Health Organization says the official number of Ebola cases and deaths may "vastly underestimate" the scale of the outbreak. So how bad is it really?

Ebola is spreading faster than efforts to stop it in West Africa, the World Health Organization says. Places hardest hit don't have enough doctors, nurses and medical equipment to contain the virus.

The last time was 1991, when the U.S. rushed to the aid of the Kurds. That mission offers several lessons as the U.S. embarks on a new operation to help the besieged Yazidi religious sect.

Dr. Kent Brantly and missionary Nancy Writebol have gone through "a rigorous course of treatment and thorough testing," Emory University Hospital's Dr. Bruce Ribner says.

Changes to workers' compensation laws mean families and government bear more of the costs that result from injuries on the job.