In the era when people traveled by sailing ship and steamer, illnesses usually burned themselves out before boats reached shore, a new study finds.

The outbreak may be the first ever documented in marine mammals.

Wildfire smoke from the Western United States and Canada is blowing across the Northeast, lowering air quality and endangering vulnerable populations.

A large study showed that for most patients, having both breasts removed after cancer was detected in one made no difference.

A new study paints a complex picture of the outbreak, suggesting that the virus could be spreading in multiple ways and that it is not always mild in cows.

Progress in the quest to help progeria patients suggests that gene editing techniques may help treat other ultrarare conditions.