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Time Travel And Photos Of Earth's 'Oldest' Animals
What if a dinosaur was found in Africa? Would you consider it worthy of conservation? If so, why — and why not a horseshoe crab species that's even older? That's what photographer Piotr Naskrecki wants to know.

Drilling Team Finally Hits Antarctica's Liquid Lake
After years of trying, Russian scientists say they have drilled into an Antarctic lake that is buried beneath more than two miles of ice. They are looking for signs of life that haven't been exposed to sky in 20 million years.

20 Million Years Later, Russians Work To Drill Into Lake
Russian researchers in Antarctica are on the verge of piercing a hole through two miles of ice into an ancient lake, untouched by the light of day for some 20 million years. But it'll be a delicate process to break through without disturbing the pristine waters. Guest host David Green speaks with Antarctic researcher John Priscu about the process.

Sturgeon Scarcity Affects More Than Caviar
Sturgeon have been swimming around for more than 200 million years, but their eggs are sought after for caviar. This week, the National Marine Fisheries Service placed the Atlantic sturgeon on its endangered species list. Guest host David Greene speaks with Dr. Ellen Pikitch, executive director of the Institute for Ocean Conservation Science at Stony Brook University.

New USDA Map May Mean Earlier Planting In North
A new map from the USDA has some northern gardeners hoping to grow plants that used to be considered too fragile for cold weather zones. The hardiness zone chart is about a half zone warmer than the last one issued in 1990. The USDA says the changes are not due to global warming, but to more sophisticated mapping methods. Seed sellers and buyers say that, whatever the reason, the warmer temperatures expand possibilities for planting this spring.

'Arctic Oscilliation' Behind Season's Mixed Winter Weather
For snow fans in the contiguous US, this winter has left much to be desired. The warm and mild season in the lower 48 and the wild snow dumps and cold weather up north in Alaska can be blamed largely on a weather pattern called "arctic oscillation." Audie Cornish gets an explanation of the weather phenomenon from meteorologist Jeffrey Masters.

Tick Tally Reveals Lyme Disease Risk
Researchers counted more than 5,000 ticks to calculate the risk of Lyme disease in the Eastern U.S. Turns out the risk is high in the Northeast and nearly zero in the South.

Is Today's Beef Better For The Environment?
A new study wants to rectify beef's image as an environmental miscreant. It says modern beef production is a lot kinder to the environment than it was 30 years ago.

Invasive Pythons Put Squeeze On Everglades' Animals
Burmese pythons have been slithering around south Florida for decades, but scientists now say the invasive constrictors are so bad, they're eating their way through the swamps. The snakes have decimated populations of mammals like raccoons, possums and white-tailed deer.

Pacific Mackerel Stocks That Feed Farmed Salmon In Decline
At current rates of overfishing, jack mackerel stocks in the southern Pacific could collapse soon, the International Consortium of Investigative Journalists reports.

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