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 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?

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  • I just saw a movie where the main character, a British secret agent, is revived after 30 years on ice. Are scientists actually working on this stuff?

    I just saw a movie where the main character, a British secret agent, is revived after 30 years on ice. Are scientists actually working on this stuff?

    I just saw a movie where the main character, a British secret agent has been "frozen." In the film, he is revived after 30 years on ice. My friend says scientists are actually working on this stuff. What's up with that? See more »

  • What are motion cards and how do they work?

    What are motion cards and how do they 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 more »

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