BrainStuff

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Latest Episodes:

Why do they add iodine to salt? Nov 30, 2012

Show notes

Table salt contains iodine to help prevent thyroid problems and iodine deficiencies. Find out how table salt keeps your thyroid happy -- and what iodine has to do with a nuclear attack -- in this episode of BrainStuff.

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What does RSVP mean? Nov 14, 2012

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Most people are familiar with the concept of replying to a party invitation via R.S.V.P., but what exactly do those letters represent? Learn more about the origins and practices of etiquette in this episode of BrainStuff.

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How does gravity work? Oct 24, 2012

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Gravity affects us every single day, but how does this oh-so-common force of nature work? Tune in to this podcast from HowStuffWorks.com to take a look at the nuts and bolts of gravity.

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Why is there a small hole on the top of spray can lids? Oct 22, 2012

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Many spray can lids have a tiny hole at the top. Check out this HowStuffWorks podcast to learn more about spray cans, shipping and air pressure.

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Why doesn’t the vacuum of space suck away Earth’s atmosphere? Oct 01, 2012

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It's often said that "nature abhors a vacuum." If that's true, then why doesn't the vacuum of space suck away our atmosphere? Tune in as Marshall Brain explains the science behind vacuums in this HowStuffWorks podcast.

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How Replacing Toilets Work Sep 28, 2012

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A family of four can consume more than 300 gallons of water per day. Old toilets use 5 gallons per flush, and this water use quickly adds up. Check out this HowStuffWorks podcast and learn why cities across the US are replacing their old commodes.

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What do those plastic recycling symbols mean? Sep 21, 2012

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A typical recycling symbol on plastic looks like a triangle made of arrows. There are seven different types of plastic indicated by the symbols. Check out this HowStuffWorks podcast to learn the difference between each of these plastic types.

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How does a Fresnel lens work? Sep 17, 2012

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The thin piece of plastic called a Fresnel lens solves some of the problems inherent in traditional magnifying lenses. Learn more about the benefits and weaknesses of Fresnel lenses in this podcast from HowStuffWorks.com.

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What makes your arms, legs and feet fall asleep? Aug 31, 2012

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When you put prolonged pressure on your feet, arms or legs, you temporarily cut off or scramble communications between your brain and your body parts. Marshall explains exactly what happens when body parts "fall sleep" in this episode.

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Why is the Nissan Leaf such a big deal? Aug 27, 2012

Show notes

Nissan recently released the Leaf, a model which may be the first viable electric car to come on the market. How does it work? Why do people have high hopes for it? Tune in to this podcast from HowStuffWorks.com to find out more about the Nissan Leaf.

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