The universe is being pushed apart at a faster and faster rate. And the culprit? Dark energy. Astrophysicist Adam Riess shared the 2011 Nobel Prize in Physics for that discovery, and now's your chance to ask him about it--or anything else you've been wondering about the cosmos.
An protester shares his anti-doping message during the 2012 Tour de France.
Credit Joel Saget / AFP/Getty Images
If there is value in spectator sports, it surely has something to do with the opportunities they provide for teaching us about human striving, doing, the surmounting of obstacles and the very many different ways there are of failing to make it over. Sometimes we are beaten; and sometimes we beat ourselves; luck is often the decider. And sometimes we make our own fate.
During the Olympics all this is writ large, so for the next few weeks, here at 13.7, I'll be writing about sports and human action.
Watermelon with seeds is getting harder to find at the supermarket.
Many people think of the seedless watermelons popping up at grocery stores and markets everywhere in the last few years as a marvel of modern scientific technology. In fact, more than 60 percent of watermelon shoppers seek this smoother pink flesh, and the numbers are increasing every year, according to a recent survey done for the National Watermelon Promotion Board.
Marcus Hook, Pa., had been a refinery town for 109 years. But caught in big changes to the world of energy, the plant shut down last winter. Now the community's young mayor wants to reinvent the community as a hub for the natural gas industry.
Each summer, about half of the surface of the Greenland ice sheet melts. That's on average, but this month, in just four days, an estimated 97 percent of the ice sheet's surface has already melted. That rate is abnormally fast and it comes just a week after a huge iceberg broke off a glacier in Greenland.
For more now, I'm joined by Tom Wagner. He's a scientist at NASA. Hi there, Tom.
TOM WAGNER: Hello.
CORNISH: Now, to start, how'd this come to NASA's attention?
Images released Tuesday show the extent of surface melt on Greenland's ice sheet on July 8 (left) and July 12 (right). Measurements from three satellites showed that on July 8, about 40 percent of the ice sheet had undergone thawing at or near the surface. By July 12, 97 percent of the ice sheet surface had thawed.
Credit AFP/Getty Images/NASA
A pair of NASA satellite images taken just four days apart tells a potentially worrying story of melting ice in the polar summer.
The first, snapped from orbit on July 8, shows about 40 percent of the Greenland ice sheet shaded in pink or red to illustrate probable or confirmed surface melting. The second photo, taken on July 12, shows nearly the entire land mass — 97 percent — blotched in a red hue.
Originally published on Sat February 2, 2013 10:03 am
Credit David Binder
Photographer David Binder began documenting stories about AIDS in the late 1980s and became well known for humanizing the epidemic for various publications, including Life magazine and The Philadelphia Inquirer.
Originally published on Wed August 1, 2012 12:02 pm
An artist's impression of the <a href="http://www.eso.org/public/news/eso1229/">quasar 3C 279</a>, about five billion light years away. This quasar contains a black hole with a mass about one billion times that of the sun.
Credit M. Kornmesser / ESO
This August, physicists are celebrating the 100th anniversary of the discovery of cosmic rays, showers of particles raining down on us from outer space. Although much has been learned about the nature and composition of cosmic rays, many puzzling questions remain. No one knows what physical processes could possibly accelerate particles to energies millions of times higher than those reached at CERN's Large Hadron Collider, where the Higgs was recently discovered.