Science

When it comes to police using force, what is acceptable and when? And are police too aggressive? Cops say they're trying to survive, but reformers say aggressive cop culture is making things worse.

If you have a problem with your heart or liver, the diagnosis is likely to be made by a lab test or medical image. But neurologist Allan Ropper says those tests often fail when it comes to the brain.

If you don't think you like bitter foods, try them again. Jennifer McLagan, the author of Bitter: A Taste of the World's Most Dangerous Flavor, is on a mission to change hearts and minds.

El Hierro, the most remote of Spain's Canary Islands, used to import thousands of tons of diesel each year. Now a new power plant will let the island run entirely on renewable energy.

For some survivors of head and neck cancer, the mask each had to wear to guide beams of radiation therapy remains a potent symbol. Some destroy the mask afterward. Others see a new beginning.

A U.S. probe cost $637 million to get to Mars; an Indian mission cost about a tenth as much. There are at least a few reasons why, both teams agree — starting with the differing shapes of each orbit.

In one coastal community, some residents are trying to get manatees off the endangered species list. But manatee advocates say the sea cows, threatened by ecotourism, need more protection, not less.