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You asked:Marshall Brain Answered:If you are a cannon ball and you jump into a pool of mercury, it would look like this:That happens because mercury weighs about 13.5 grams per cubic centimeter. Water, for comparison, weighs 1 gram per cc. So a 1-lit ...

You asked:Marshall Brain Answered:So we can ask, How long does it take the shuttle to reach an altitude of 100 kilometers?The solid rocket boosters burn for about Let's ignore the acceleration (So it takes approximately 150 seconds for the shuttle to ...

You asked:Marshall Brain Answered:If you want to buy a small gas turbine engine, this page can be helpful: But if you want to pursue the DIY option, many people get started in gas turbine creation using an old A basic jet engine has three parts: a co ...

In many parts of the world, leeches are surprisingly common. You can find them in Amazon jungles, but you can also find them in the local lake. They can be found in swimming in water or crawling on land. For example, if you jump to the 40-second poin ...

You AskedMarshall AnsweredThe basic idea used to create a jigsaw puzzle in a factory is die cutting. You can see the die cutting process in this video:But if you want to make a jigsaw puzzle at home, you can use a jigsaw (also known as a scroll saw), ...

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 ...