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Podcast by category | back
1. What Is Fire?
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The ancient Greeks believed that fire—along with earth, water, and air—was one of the four essential elements that made up the world. This might leave you wondering where fire truly fits in. What exactly is fire?
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public date: Wed, 31 Dec 2008 10:15:14 -0500 - (1 MB Type: MPEG)
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2. You Snooze or You Lose
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It's such a commonplace event that you probably never asked yourself why you sleep. But from a scientific point of view, this is far from a mundane matter — in fact, for sleep researchers, it's one of the biggest unanswered questions in the field.
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public date: Tue, 30 Dec 2008 09:45:46 -0500 - (1 MB Type: MPEG)
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3. The Oldest Sweetener, the Freshest Bread
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Today honey is mostly used for its distinctive flavor, but for baking it has another advantage as well: baked goods made with honey take longer to get stale.
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public date: Mon, 29 Dec 2008 10:34:40 -0500 - (1 MB Type: MPEG)
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4. Honey: Food for Yeast or a Natural Preservative
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In ancient times, honey was used as a food preservative. It works as a preservative because the high concentration of sugar in honey forces the water out of any yeast or bacteria cells that could otherwise contaminate the food.
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public date: Fri, 26 Dec 2008 10:14:43 -0500 - (1 MB Type: MPEG)
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5. Diet and the Evolution of Big Brains
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Our development of larger brains had much to do with our evolution as a species. But the question is, what fueled the development of those larger brains?
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public date: Thu, 25 Dec 2008 09:44:17 -0500 - (1 MB Type: MPEG)
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6. Cold Feet and Hot Wings
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Most birds you see standing on only one leg are doing an impressive balancing act while tucking the second leg into their feathers. Why do they do that?
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public date: Wed, 24 Dec 2008 10:24:25 -0500 - (2 MB Type: MPEG)
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7. A Hyena's Sibling Rivalry
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If you grew up with a brother or sister, you probably know what sibling rivalry is like. For a spotted hyena though, sibling rivalry is a matter of life and death.
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public date: Tue, 23 Dec 2008 09:54:17 -0500 - (1 MB Type: MPEG)
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8. A Suicidal Survival Strategy
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If a minnow's skin is damaged by an attacking pike, it releases a chemical that attracts more pike. Why would a minnow that's already being attacked want to attract more trouble? Do injured minnows have some kind of crazy death wish?
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public date: Mon, 22 Dec 2008 10:34:45 -0500 - (1 MB Type: MPEG)
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9. Cats Who Flex
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If a cat is in your lap, you may feel its claws digging in, just lightly, in a slow, left-right pattern. Owners soon come to associate this odd-seeming behavior with good feelings on the cat's part. But where does it come from?
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public date: Fri, 19 Dec 2008 10:14:44 -0500 - (2 MB Type: MPEG)
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10. Lying to a Machine
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The so-called lie detector tests you've heard of are usually polygraph tests. How does this test work, and how accurate is it?
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public date: Thu, 18 Dec 2008 09:35:04 -0500 - (1 MB Type: MPEG)
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