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The updated guidelines make key changes to earlier language and include a new color-coded chart that divides school reopening options into four zones based on the level of community transmission.

The 25-year-old Ohio woman got within 10 feet of the bison before the animal gored her and tossed her 10 feet into the air. She sustained a puncture wound and other injuries.

Award-winning science journalist Alison Richards is deputy supervising senior editor for NPR's science desk.

The owners of a Kentucky cavern say they've made the world's largest indoor bike park, with 320,000 square feet of riding. It just happens to be 100 feet below the surface.

Workers added a steel column this afternoon, making the skyscrapere 21 feet taller than the observation deck at the Empire State Building. That's a symbolic return to the sky for a site destroyed in the Sept. 11, 2001, terrorist attacks.

Residents of Pakistan's Himalayan region turn to science and folklore, with backing from the U.N. They're erecting ice towers, harvesting avalanches and performing an ancient glacier ritual.

A group that measures river basin health cited the poor condition of infrastructure such as locks and dams, among other things, on what it says is the world's fourth-largest watershed.

Hunger can make many people "hangry," or irritable. But new research suggests that we may have another, innate response to hunger: a desire to help others in need.

The former House speaker began his career as a history professor at West Georgia College. "He thought he could have some kind of impact, to get kids to think," says a friend and former colleague. "But he really wanted to get into politics."

A ship full of researchers is crossing the Arctic attached to an ice floe. But finding the right chunk of sea ice was a challenge, in part because warmer temperatures are making it thinner.