Daily Audio Program

Daily Audio Program
Daily Audio Program Index




Announcing Sacred Mounds, a novel of Magical Realism and Historical Fantasy from Jim Metzner, with a foreword by Hutke Fields, principal chief of the Natchez Nation.
Cyclonic hordes of insects, a telepathic despot, body-swapping sex - just a few of the surprises Salvador Samuels encounters when he is swept back to pre-colonial times, walking in the moccasins of a blind Indian - who, in turn, has been transported into Salvador's body in present-day America. Sacred Mounds Book Cover Four hundred years apart, they are bound by a mission to rescue our world, aided by the mysterious presence of the mounds. Thousands of these ancient earthworks once dotted the landscape of North America. We still don't know why they were created. Sacred Mounds suggests they are as important today as when they were made over a thousand years ago. Sacred Mounds weaves the stories of two men, each a stranger in a strange land. With the help of two remarkable women, they must find a way to save our planet and return home.
iTunes   Twitter   Facebook   RSS feed available here
Kids' Science Challenge: Biomimicry - Toe Hair: The Pulse of the Planet daily radio program offers free legal online mp3 downloads, exploring the world of sound in nature, culture and science, with audio adventures, world music, extraordinary sound portraits, science diaries, and nature ring-tones; an amazing sonic experience.

Airdate: Jan 14, 2010
Scientist: Bob Full

Kids' Science Challenge: Biomimicry - Toe Hair

Kids' Science Challenge: Biomimicry - Toe Hair
Hairy toesREALLY hairy toesare essential to a gecko's wall-climbing ability.

music; ambience

JM: Hairy toes and millions of split ends could be a recipe for embarrassment for you or me. But for a gecko, they're extremely useful tools. I'm Jim Metzner, and this is the Pulse of the Planet. A gecko's ability to climb vertically on a piece of glass has to do with its toe hair, and lots of it. University of California biologist Bob Full explains.

BF: Here's the tokay gecko, and if we look at its feet, what we see is that they have these leaf-like structures. And if we look at one toe, we see these leaves, and notice they're not solid. There are little structures in there and we can zoom in on those. Look at one of the leaves, and what we see is that it looks like a rug. You can see all the hairs in the rug when you increase it 270 times. And then, if we look more closely 900 times you can see one of these hairs, and there's something going on at the end of the hair. It's not a solid piece either. And here's the secret of how geckos stick to things. They have the worst case of split ends possible. And a gecko has about a billion of these little nano-size split ends. That's eight-millionths of an inch big really small. There's the gecko foot. There's one of the gecko hairs. Gecko hairs are small, but that's not what sticks. If you look at the end, those are the tiny, little branches that stick to the other surface.

JM: Millions of microscopic hairs give a gecko's toe incredible surface area, which attracts it on a molecular level to vertical surfaces.

Bob Full is one of the participating scientists in this year's Kids' Science Challenge, our free nationwide competition for third to sixth graders, made possible by the National Science Foundation. Can you think up a bio-inspired invention? Then check out kidsciencechallenge.com. I'm Jim Metzner.