Rhino poaching has been on the rise in the past few years. In South Africa and other regions where rhinos run, poachers have been killing or darting rhinos with tranquilizers for their horns.
Rather than adorning walls, many horns are ground up into medicines, sold mostly in Southeast Asia. A possible — yet controversial — way to stop poaching may be rhino ranches, where the horns are harvested for sale and the animals are allowed to grow new ones.
Robert Siegel talks to retired Navy Captain Don Walsh about the attempt by movie director James Cameron to take a submersible capsule to the bottom of the Mariana Trench — the deepest spot on Earth. Walsh says it will be a combination of science and adventure, because Cameron is a storyteller and dedicated amateur explorer. Walsh made a 1960 dive to the same trench.
A U.S. soldier instructs Afghan soldiers in the western city of Herat last July. Afghans in security force uniforms have killed a number of U.S. and NATO troops recently. The shootings come as NATO works to prepare the Afghan forces to take control of security.
Army Capt. Joe Fritze (right), who trains Afghan police officers in Kabul, works closely with interpreter Gul Agha Shirazi. Fritze says he depends on Shirazi not just to translate, but to warn him if he senses anything suspicious or dangerous.
In Afghanistan, the killings are called "green on blue" — that's when an Afghan soldier or police officer turns his gun on a NATO ally.
There was a wave of such violence just last month after U.S. soldiers accidentally burned Korans. Over the next week, six Americans were killed, apparently at the hands of Afghans working with the U.S.
The top U.S. and NATO commanders in Afghanistan think they have some answers to this recurring problem, and it's up to U.S. soldiers like Capt. Joe Fritze to see if they work.
Meet Willow Tufano, age 14: Lady Gaga fan, animal lover, landlord.
In 2005, when Willow was 7, the housing market was booming. Home prices in some Florida neighborhoods nearly doubled from one month to the next. Her family moved into a big house; her mom became a real estate agent.
But as Willow moved from childhood to adolescence, the market turned, and the neighborhood emptied out. "Everyone is getting foreclosed on here," she says.
It's been an unusually warm winter in some parts of the country, with springtime temperatures and very little snow. How is nature responding? Purdue entomologist Tom Turpin and horticulturalist Kristin Schleiter of the New York Botanical Garden discuss how an early spring affects flower buds, beetles and bees.