U.S. presidential candidates advertise in battleground states to increase voter turnout. But a new study says ads also have a big impact on campaign contributions.
These birds fly from Europe to sub-Saharan Africa, but they don't touch down on the continent. Researchers say new findings raise questions about "when and to what extent swifts need to sleep."
A small rock might contain tissue from a 130 million-year-old dinosaur brain. If confirmed, it would be the first bit of fossilized dino gray matter ever found.
Four years of too little water is killing millions of trees in the Sierra, yet some giant sequoias still thrive. Tree-climbing scientists are exploring sequoias branch by branch to find their secret.
The WWF report asserts that wildlife populations have dropped by a startling percentage since 1970. The details and extent of that decline, however, are more complex than any one number can capture.
Most research on placebos involves people who think they're getting an active treatment, but aren't. But they may also work when people know full well they're getting a sham treatment.
The results are mixed for fourth-, eighth- and 12th-graders. More than that, though, experts say the nation's report card may be out of step with the latest goals for science learning.
A Canadian flight attendant had been blamed by media for years for bringing HIV to the U.S. A new study proves that's impossible. The virus that took hold came from Haiti in the early 1970s.
The Centers for Disease Control and Prevention now urges pregnant women to "consider postponing travel to all parts of Miami-Dade County." Zika is on the way to becoming an endemic disease in the U.S.
Residents affected by a leak of a coal-washing chemical into the Elk River reached a deal with a chemical company. A class-action suit against a water company was set to move forward in federal court.