Brainstuff

A public address system's speakers emit strange noises, or feedback, when sound gets re-amplified. Get a detailed explanation of how feedback occurs in this podcast from HowStuffWorks.com.A public address system's speakers emit strange noises, or feedback, when sound gets re-amplified. Get a detailed explanation of how feedback occurs in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Dry ice is different from regular ice in several ways. Find out what makes dry ice so unique -- and why it's so good for transporting perishables over long distances -- in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Under certain circumstances, diesel engines can operate while submerged in water. Find out what it takes to waterproof an engine -- and why diesel engines are better candidates than their gasoline counterparts -- in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Most cork comes from special trees that grow in places near the Mediterranean Sea. Learn more about cork oak trees, cork properties, cork products and cork processing in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Today, Pez candy dispensers are a sweet treat for children and a novelty for adults. Originally, however, they were created to help adults quit smoking. Learn more about the fascinating history of Pez in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Sea level is an important measurement, but it's also a complicated one. Find out why in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The sound quality of vinyl records is sometimes better than that of CDs and DVDs -- and sometimes worse. Learn more about the difference between the sound quality of records, CDs and DVDs in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Although it's common in some countries, high-speed rail service isn't available in the United States -- yet. Tune in to learn more about this swift rail service -- and how soon we're likely to have it in the U.S. -- in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Traffic lights detect vehicles using a variety of methods. Check out this podcast from HowStuffWorks.com to find out how timers, inductive loops and other detectors keep traffic running smoothly. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Gas turbine engines often power jet airplanes and helicopters, but they may turn up in other applications in the near future. Discover how turbine engines work in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Self-winding watches keep the time with the help of a piece of metal, gravity and the natural movement of your arm. Tune in to learn more about self-winding watches in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You've probably heard that catnip drives felines wild, but did you know that it's a plant related to mint? And that it doesn't affect all cats? Find out how catnip works in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

When the temperature dips below freezing, precipitation often turns into snow, but sometimes you'll get freezing rain or sleet. Why? Find out in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You've probably had countless fortune cookies after Chinese meals, but have you ever wondered how they're made? Discover the "food technology" behind those prescient little cookies in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The afterburner on a jet engine adds thrust to the engine. Tune in as Marshall Brain explains how an afterburner works -- and the pros and cons of using one -- in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

A magneto is a kind of electrical generator used in small gasoline engines in lieu of a battery. Find out how magnetos work in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Most leather is made from processed cattle skin, although synthetic and other varieties exist. Learn more about leather in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There are hundreds of satellites orbiting the Earth, but it's not always easy to see them. Get Marshall's tips on how to spot satellites in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The sonic booms formed by planes are similar to the wakes left by boats in water. To learn more about sonic booms, check out this HowStuffWorks podcast. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Self-setting clocks and watches synchronize themselves with the atomic clock in Colorado with the help of a special radio station. Find out how -- and learn more about NIST's radio station -- in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.