Tim DeChristopher was to go to prison, convicted of disrupting a government sale of oil and gas leases. He called his actions an act off civil disobedience against climate change. Prosecutors called them felonies. Ahead of his confinement, DeChristopher wanted to go on a final wilderness adventure.

Some 500 years after Columbus first encountered cocoa beans, scientists are discovering new, wild cacao flavors in the Amazon rainforest. Turns out, we've barely begun to sample the many flavors nature has to offer.

Under most laws, young people are recognized as adults at age 18. But emerging science about brain development suggests that most people don't reach full maturity until the age 25. Guest host Tony Cox discusses the research and its implications with Sandra Aamodt, neuroscientist and co-author of the book Welcome to Your Child's Brain.

Imagine the U.S. government saying to the people living around Yellowstone, "You know what? All those wild animals in the park — the grizzlies, the bison, the wolves — they belong to you." This is exactly what the government of Namibia has done in a radical experiment to save wildlife — and the people who share their land.

It's known as the Viagra of the Himalayas, and it can cost as much as $50,000 a pound. The world's most expensive fungus is known in Tibetan as yartsa gunbu and has become a status symbol in China.

It's time to celebrate millimeters, kilograms, liters and hectares! it's National Metric Week, and the U.S. stands almost alone in its lack of affection for the Système international d'unités. Serious repercussions have resulted; just ask NASA about their Mars Orbiter.

Plans for a bio-defense animal laboratory at Fort Detrick have scientists and lawmakers concerned for the community's safety.