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When CBS announced a new show where activists would take part in competitions, critics said the format made a mockery of actual activism. Now, the show will drop the competitive element.

Science writer Chris Solomon tells NPR's Arun Rath that global warming has caused an influx of new diseases in animals that could eventually spread to humans.

Kelly says his twin brother, Scott Kelly, who just returned to Earth after 340 days in space, was temporarily 2 inches taller. NASA is studying the pair to explore what spaceflight does to the body.

Scientists have assembled a lab system from living tissue that can replicate a woman's 28-day hormonal cycle. The goal is to use the system to find new ways to treat a host of women's health problems.

Yellowstone National Park is often overwhelmed by cars. But right now, only bicycles are allowed on some popular park roads. But bikers have to be ready to dodge bears, wolves and other wildlife.

California regulators say Nestle lacks the legal permits for millions of gallons of water it extracts from the San Bernardino National Forest and sells under the Arrowhead brand.

NPR's Lulu Garcia Navarro talks with Rep. Jerry McNerney, Democrat of California, about his new bill to research the effects and risks of "geoengineering" the planet as a way to fight climate change.

A new study suggests that being a morning person makes you slightly less susceptible to depression or mental illness. It, however, is not a very big effect.

A lot of vaccines and some medications need to be delivered by injection. Two groups of researchers are designing ways of delivering these medications by putting them in pill form.

Humans have been smoking pot to get high since the first millennium B.C. Archaeologists have found early evidence of cannabis use from wooden bowls exhumed from ancient tombs in western China.