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How Metal Detectors Work

electronics.howstuffworks.com/gadgets/other-gadgets/metal-detector.htm

Metal detectors can help you find metal buried deep in the ground. Find out how metal detectors work and learn about the different types of metal detectors.

How Lie Detectors Work

people.howstuffworks.com/lie-detector.htm

Lie detection is a consistently controversial topic -- how can a machine tell truth from deception? Does everyone have the same physiological reaction when telling a lie? If so, how can some people "beat the box"? Find out what these devices measure and if they really can detect lies.

How Carbon Monoxide Detectors Work

home.howstuffworks.com/home-improvement/household-safety/carbon-monoxide-detector.htm

Carbon monoxide detectors help protect your family from deadly carbon monoxide gas. Find out how carbon monoxide detectors sense dangerous molecules.

How An Oscillator Works

electronics.howstuffworks.com/oscillator.htm

Oscillators show up in lots of electronic equipment. In fact, you might be surprised to know that computers, radios, metal detectors, and stun guns all use oscillators. Read on to learn how an oscillator works!

How Airport Security Works

science.howstuffworks.com/transport/flight/modern/airport-security.htm

According to the Department of Homeland Security 730 million people travel on passenger jets every year. Are these folks safe? Find out how high-tech solutions are being used to make flying as safe as possible.

Hotel Security Experts Warn About Learning the Wrong Lessons in Wake of Las Vegas Shooting

people.howstuffworks.com/hotel-security-experts-warn-wrong-lessons-in-wake-las-vegas-shooting.htm

The Las Vegas music festival massacre has made Americans think more about hotel security. HowStuffWorks talks to experts about what should be done.

How Millimeter Wave Scanners Work

science.howstuffworks.com/millimeter-wave-scanner.htm

If you've traveled recently, you probably raised your arms above your head and waited for a millimeter wave scanner to do its screening thing. During those 10 seconds or so, did you ever wonder exactly how the device produced your image?

How much gold is there in the world?

money.howstuffworks.com/question213.htm

I recall hearing once that all of the world's gold could be formed into a cube measuring 18 feet by 18 feet on a side, or something like that. Is that true? If so, how much would it weigh and how much would it be worth?

How Landmines Work

science.howstuffworks.com/landmine.htm

Landmines have killed or maimed over 1-million people since 1975. Find out how landmines work and what countries are doing to prevent landmine tragedies.

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