BrainStuff

Intrauterine devices (IUDs) are a popular and effective method of birth control. So why don't Americans ​use them?

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What is silica gel, and why do I find little packets of it in everything I buy? Christian explains it all in this episode.

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Sure, rearview mirrors are cool -- but how do they actually work? How can the same piece of glass have two different amounts of reflection? Join Christian as he explains the science behind these handy devices.

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Some figs need fig wasps to pollinate their fruit. But are we eating dead wasps every time we bite into a fig?

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Have you ever wondered how accents work? Tune in to this episode of BrainStuff to find out about the ever-evolving accent.

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For some people, winter means a daily battle against cracking, scaling or peeling lips. But what actually causes chapped lips? How can you prevent it?

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Cats purr for all kinds of reasons, including communication and healing themselves. Christian explains how purring works and which cats can't do it.

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They’re just horses with stripes, right? So why don’t we ride them around like Seabiscuit or Black Beauty?

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The stomach is a hollow, many-layered organ that produces powerful acids to break down food -- and another substance to protect the stomach from being digested. Find out what this substance is, and learn more about the stomach, in this episode.

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Cars rely on batteries to keep their electrical parts running and alternators to keep their batteries alive. Battery lights come into play when there's a charging problem. Find out more about battery lights in this podcast from HowStuffWorks.com.

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