Devices

Ever wondered how that thing works? Explore the inner workings of many common devices and inventions, as well as those that aren't so common, such as compasses, gyroscopes and bug zappers.

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How Anti-shoplifting Devices Work

A fascinating article that examines the variety of anti-shoplifting devices being used by retail businesses and how these systems and devices work!


How X-rays Work

X-ray machines seem to do the impossible: They see straight through clothing, flesh and even metal, thanks to some very cool scientific principles at work. Find out how X-ray machines see straight to your bones.

How strong are the magnets in an MRI machine?

A friend of mine told me that his watch flew off his arm and was sucked into the MRI machine at the hospital. Could this really happen? How strong are the magnets in an MRI machine?

I've heard that bug zappers can actually help transmit diseases -- how does that happen? Once the mosquito dies, how can a disease it was carrying be transmitted?

I've heard of bank robbers being foiled by a "dye pack" put in their money stash. What is a "dye pack"?

I've heard of bank robbers being foiled by a "dye pack" put in their money stash. What is a "dye pack"?

How does a Galileo thermometer work?

One of my co-workers has an interesting thermometer on his desk. It is a glass tube with different-colored floating things in it. What kind of thermometer is this, and how does it work?

How does a rebreather work?

Unlike a regular SCUBA regulator which creates bubbles when the person wearing the apparatus exhales, a rebreather produces no bubbles when someone exhales. What exactly is a rebreather and how does it work?

A friend of mine showed me this card that the image changed depending on the angle that you view it at. How does that work?

See "Back to the Future 2"? Drool much over those hoverboards? Find out how these devices will work and see one that already does!

How Ultrasound Works

Ultrasound lets us peek into the human body to see everything from heart valves to a moving baby. But how do sound waves give us a picture?

How does "bulletproof" glass work?

In a lot of movies you see windows that are "bulletproof." Does bulletproof glass really exist, and if so, how does it work?