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You AskedMarshall AnsweredThe thing to notice is the spinning disk below the dials. The disk is moving slowly in this video - about one RPM. In most common electric meters in the U.S., it is the rotation of this disk that lets the electric company me ...

You Asked:Marshall Answered:Meanwhile, real human beings seem so be stuck with bulky compressed air tanks or The gills of a fish work a lot like your There is such a thing as "artificial gills" that mechanically extract oxygen from water fo ...

You Asked:Marshall Answered:...have a lot more body hair than others?As described on So your arm hairs have much shorter growth phases than your head hairs do. In most people, that keeps arm hair relatively short. But not in all people. Some people c ...

Icynene is a spray-on foam insulation that you can use to insulate a home. Typically it would be used during new construction because (as seen in the videos below) in needs to be sprayed on like paint before the sheetrock goes on. The advantages clai ...

You Asked:Marshall Answered:A As a general rule:1) You can charge and discharge a capacitor much more quickly than you can a battery. The chemical reactions in a battery take time.2) A capacitor doesn't really "wear out", while a battery do ...

You Asked:Marshall Answered:Let's say that you want to make salt from salt water. You can simply put salt water on the stove and boil it. The salt is completely unaffected by heat, so it doesn't matter how fast you boil it. Eventually all the water i ...

You Asked:Marshall Answered:So how do gray squirrels find all the buried nuts? As described in the article, they don't find a lot of them. To be more specific, How do gray squirrels find the nuts that they bury? Obviously, in most cases, they do not ...

You Asked:Marshall Answered:When you compress air, it gets hot. When air gets hot, it expands. This defeats the purpose of the turbocharger, since the expansion means that the engine gets less air than it could. An intercooler is a big radiator. You ...

You Asked:Marshall Answered:The basic idea is simple though. You now have to manipulate a Practice this in a big, empty parking lot. Push in the clutch. Put the car in first gear. Give the engine a little gas (say to 2,000 RPM). Let the clutch out sl ...

Lots of people like to grill their meat, but this popular cooking method has been linked to cancer. Discover how chemical reactions make grilled meat potentially carcinogenic in this podcast from HowStuffWorks.com.

How long can a germ last outside the body? It depends. Tune in to this podcast from HowStuffWorks.com to find out how different germs fare outside the body.

There are several types of fog machines, each with specific advantages and disadvantages. Listen in to learn more about fog machines.

Customers are increasingly choosing long-lasting alternatives to traditional incandescent lights. But are florescent lightbulbs really more efficient than traditional lightbulbs? Listen in and find out in this podcast from HowStuffWorks.com.

Any liquid-cooled car engine has a thermostat that blocks the flow of coolant to the radiator. Learn how the thermostat works to reduce wear, deposits and emissions in this podcast from HowStuffWorks.com.

With green screen technology, film makers, TV producers and even the YouTuber next door can create all kinds of interesting effects. It used to be that you did everything with film techniques, as described in this article:How Blue Screen WorksThe fir ...

If a boat weighs 1,000 pounds, it will sink into the water until it displaces 1,000 pounds of water. Tune in to learn how the shape of a boat allows it to displace enough water to float in this podcast from HowStuffWorks.com.

Virtual first down lines are used to indicate where play resumes in football -- but how do they work? Listen in as Marshall Brain explains how the technology superimposes a virtual line in this podcast on HowStuffWorks.com.

Dioxin is an organic chemical that consists of benzene, oxygen and chlorine. This chemical is also toxic. Tune in to learn more about dioxin and Agent Orange in this podcast from HowStuffWorks.com.

If you look on the label of a water filter, you'll often see the filter contains activated charcoal -- but what exactly is this stuff? Tune in as Marshall Brain explains the nature of activated charcoal in this podcast from HowStuffWorks.com.

SETI -- the Search for Extraterrestrial Intelligence -- is an enormous, global undertaking meant to detect signs of life beyond our solar system. Learn how you can help from home in this podcast from HowStuffWorks.