There are more than a thousand species of sharks and rays in the world, and nearly a quarter of them are threatened with extinction, according to a new study. That means these ancient types of fish are among the most endangered animals in the world.
The European Space Agency's Rosetta mission is back in business. For the past 31 months, the spacecraft has effectively been asleep. Most of its instruments were shut off to save energy, including the radio for communicating with Earth. Mission managers can now start preparing Rosetta for a rendezvous with a comet later this year. NPR's Joe Palca has more.
Originally published on Tue January 21, 2014 5:55 pm
If you've ever shopped at Whole Foods, you've probably noticed that some of the foods it sells claim all kinds of health and environmental virtues. From its lengthy list of unacceptable ingredients for food to its strict rules for how seafood is caught and meat is raised, the company sets a pretty high bar for what is permitted on its coveted shelves.
You drop a ball. You drop a key. You drop a piece of lead. They each slip from your hand and tumble to the ground. But you have an orderly mind (you're a physicist) and, to you, falling things don't seem haphazard — they seem neat. The unruly world has rules, laws. So instead of saying "Bummer!" you say, "Of course! How beautiful! How logical!"
Scientists are celebrating after receiving a signal from a spacecraft on a very long journey. The Rosetta is traveling through the heavens to study a comet in more detail than ever before. As NPR's Rob Stein reports, the Rosetta spacecraft's call home meant the robot onboard had successfully awakened itself from a long hibernation, and is now on course to achieve its historic mission.