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"Protecting biodiversity amounts to protecting humanity," says UNESCO Director-General Audrey Azoulay, who warns that species are being lost at an alarming rate.

Anesthesia revolutionized surgery by vanquishing patients' pain. But many of the chemicals are greenhouse gases. One Oregon doctor who has done the math says some are much less damaging to the planet.

More than 10 states are considering tightening their vaccine laws in response to what health officials say is the worst year for measles in 25 years. The bills are spurring passionate opposition.

Treatment with genetically altered bacteriophages — viruses that attack bacteria — may have halted a patient's near-fatal infection, hinting at new ways to fight antibiotic-resistant bacteria.

The video is a true tear-jerker, driving home the song's rawest emotions by depicting motherhood's joys and drudgery with equal affection and care.

The latest round of tariffs on Chinese imports is expected to hit more products U.S. consumers actually buy, and businesses say they have no choice but to pass the added costs on to consumers.

France's military says it's mourning the men who died during the rescue of two French tourists, an American and a South Korean.

Threats to health workers are prompting a radical rethink of the Ebola strategy in the Democratic Republic of the Congo.

González, 30, won a silver medal at the Rio Summer Olympics. With the threat of suspension hanging over her, she had been training in hopes that she could compete in next year's Tokyo Games.

The Laos government and conservationists estimate there are only about 800 elephants left in all of Laos, just half of them living in the wild.