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If a balloon was filled by a vacuum -- rather than helium or air -- would it float? Check out this HowStuffWorks podcast to learn the science behind balloons and vacuum.

The idea behind a gravity assist is to use a planet's motion to accelerate a satellite. Check out our article on HowStuffWorks to learn more about the effects of gravity on satellites.

Wind farms and solar power plants are promising sources of renewable energy, but they're not as reliable as conventional power sources. In this episode, Marshall explains how large-scale storage technologies could make solar and wind power more viable.

Water is a very heavy substance -- just one gallon weighs 8 pounds. Check out this HowStuffWorks podcast to learn more about how the passage of water affects your weight.

The electric company bills its customer by the kilowatt-hour. The number of watts a device uses times the number of hours you leave it on tells you number of watt-hours it consumes, and divided by 1,000 will convert the measurement to kilowatt-hours. Listen to find out more in this podcast from HowStuffWorks.com.

Hurricanes are enormously destructive, and sometimes seem to have a mind of their own. Tune in to this HowStuffWorks podcast to learn more about hurricanes.

Since the heart is a muscle, it relies on the oxygen and nutrients contained in blood. This blood is supplied by arteries on the exterior of the heart -- when these arteries are blocked, a heart attack results. Listen to find out in this podcast from HowStuffWorks.com.

Inkjet printers shoot extremely small droplets of ink -- thirty dots per millimeter or more -- onto paper to produce a picture. Check out this HowStuffWorks podcast to learn more about inkjet printers.

Every gasoline engine has valves that work with the camshaft to let air into and out of the engine. Learn how VTEC -- Variable Valve Timing and Lift Electronic Control -- allows engines to adapt their camshafts in this HowStuffWorks podcast.

On average, human hair grows a small amount each day. Listen in as Marshall Brain explains hair growth in this podcast from HowStuffWorks.com.

The sound of gunfire is incredibly loud, and it is amazing that anything is able to silence a firearm. However, the principle behind a gun silencer is surprisingly simple. Check out our HowStuffWorks article to learn more about silencers.

The goal of headers is to make it easier for an engine to push out exhaust gasses. Check out this HowStuffWorks podcast to learn how exhaust headers channel exhaust gasses and improve engine efficiency.

The moon's gravitational pull is strong enough to affect the oceans on Earth, resulting in low and high tides. Discover exactly how high and low tides work in this podcast from HowStuffWorks.com.

Meteors burn up once they hit Earth's atmosphere, and the space shuttle would do the same if it wasn't protected. Learn more about meteors and the technologies that keep the space shuttle from burning up in this podcast from HowStuffWorks.com.

In order for a plant to grow and thrive, it needs a number of different chemical elements. Check out this podcast from HowStuffWorks to learn more about fertilizer.

Diesel submarines are actually hybrid vehicles. Find out why -- and exactly how they work -- in this podcast from HowStuffWorks.com.

You've probably heard of the beloved character Thomas the Tank Engine, but have you ever wondered what makes him a tank engine? Discover what sets Thomas apart from his locomotive pals in this podcast from HowStuffWorks.com.

Blueprinting, which has been around since 1842, is a common way to reproduce an architectural drawing. Tune in to learn more about the complex chemical processes that make blueprints blue -- and white -- in this podcast from HowStuffWorks.com.

Which came first -- the chicken or the egg? Listen in as Marshall Brain gives the technical answer -- and takes a look at the science behind eggshell formation -- in this podcast from HowStuffWorks.com.

When people fire guns into the air in a celebratory manner, those bullets have to go somewhere. Find out how high fired bullets can go -- and why they can be dangerous -- in this podcast from HowStuffWorks.com.