BrainStuff

If you fired a gun from a train moving at the speed of a bullet, what would happen? It depends on your frame of reference. Learn more about reference frames and physics in this episode of BrainStuff.

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You'll find sodium nitrate in lots of pink meats like hot dogs and salami, but why? And is it bad for you? Find out what's up with sodium nitrate in this podcast from HowStuffWorks.com.

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It's editor's choice month, so tune in and catch our editors' favorite episodes. This week, Marshall is covering cavities: They're formed by bacteria that excrete an acid onto the enamel of a tooth -- but how? Listen in to learn more.

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A single Krispy Kreme store can produce 100,000 doughnuts a day. To learn more about how these Krispy Kreme doughnuts are made, check out this HowStuffWorks podcast.

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Lots of people use humidifiers in their homes, especially in winter. But why? Marshall discusses some advantages of using humidifiers (and disadvantages of not using them) and different types of home humidifiers.

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If you've ever sweated your way through a work-out on a stair machine, you know that calories are definitely being burned in the process. But how? Learn more about foot-pounds, horsepower and stair machines in this podcast from HowStuffWorks.com.

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A Dippy Bird is a strange-looking novelty toy, but how does it work? Marshall Brain breaks down the surprisingly sophisticated mechanics of the Dippy Bird in this episode.

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Marshmallows are an old candy -- they've been around since the 1800s. The name marshmallow comes from the original recipe, which called for sap from the marshmallow plant. Check out this HowStuffWorks to learn more about the history of marshmallows.

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When it comes to making honey, bees are skilled chemists. Discover how they use enzymes to turn sugary flower nectar into a sweet, stable food source in this podcast from HowStuffWorks.com.

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If you've been to the grocery store recently, you know that eggs come in many varieties, some claiming to be better for you than others. What differentiates a normal egg from a "special" one? Find out in this podcast from HowStuffWorks.com.

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