Air pollution isn't just bad for your health.It can have dramatic effects on weather and climate. In fact, a team of scientists believes that air pollution from industries and traffic could have caused the extreme floods that devastated southwest China in 2013.
It's almost impossible to ignore a screaming baby. (Click here if you doubt that.) And now scientists think they know why.
"Screams occupy their own little patch of the soundscape that doesn't seem to be used for other things," says David Poeppel, a professor of psychology and neuroscience at New York University and director of the Department of Neuroscience at the Max Planck Institute in Frankfurt.
The Appalachian Trail (AT) runs from Springer Mountain in Georgia to Mount Katahdin in Maine, crossing 14 states for a total of 2,189 miles. This past Sunday, ultramarathon runner Scott Jurek completed a thru-hike of the AT in record-breaking time: 46 days, 8 hours and 7 minutes.
Playing sports has always been important to 31-year-old Erik Johanson, a city planner in Philadelphia. Johanson thrived in baseball and ice hockey as a kid, he says — "one of the best players on the team in high school."
Today, Johanson is married and expecting his first child but is still passionate about ice hockey — and about winning. He plays on a highly competitive team of guys who got together after college and still play weekly in an adult league; they hope to take the crown this year.
Scientists have unveiled the best photos of Pluto and its moons that humanity is likely to see for at least a generation. These images were taken Tuesday by NASA's New Horizons space probe as it hurtled past Pluto at more than 30,000 miles per hour.
Since its discovery in 1930, Pluto has revealed itself to be an oddball world. It's smaller than our own moon, and it orbits at an angle relative to the plane of the solar system. Because of its size and distance, even the Hubble Space Telescope could only make it out as a brown smudge, billions of miles away.