As a freezing winter drives many of us indoors, some extreme athletes embrace the cold as a great way to burn calories and retrain the immune system while working out. Not so fast, physiologists say.
Using Medicaid payment data from towns in Alaska that have rejected fluoride in recent years, a new study supports dentists' claims that teeth get worse when the water supply is not fluoridated.
Early in 2019, China hopes to land a rover — the first soft landing on the moon's far side. The mission is exploratory, and will lay groundwork for a trip by Chinese astronauts to the lunar surface.
Republican Orrin Hatch is leaving the Senate after 42 years. He led bipartisan efforts to get health care for more kids and AIDS patients. He also thrived on donations from the drug industry.
Roman was one of the first female executives at NASA, its first chief of astronomy and she played an instrumental role in making the Hubble Space Telescope a reality. She died on Dec. 25.
The sighting is a glimmer of hope for a species that has seen a hard few years: 19 right whales died in 2017 and 2018, and not a single North American right whale calf was seen last season.
U.S. Geological Survey says it was magnitude 7.0. No casualties have been reported. On Dec. 22, a tsunami, likely caused by the volcano Anak Krakatau, hit Indonesia and killed about 430 people.
NPR's Debbie Elliott asks Bloomberg energy reporter Jennifer Dlouhy about the Trump administration's moves to weaken environmental regulations this past year.