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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10 Inventions by Thomas Edison (That You've Never Heard Of)

It's common knowledge that Thomas Edison invented the incandescent light bulb and the phonograph, but did you know he also developed concrete furniture and a phone to communicate with the dead?

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  • How does "bulletproof" glass work?
    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? See more »

  • How does a Galileo thermometer work?
    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? See more »

  • How does a rebreather 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? See more »

  • How Electromagnets Work
    How Electromagnets Work

    Whether they're sorting out scrap metal or helping us unlock the secrets of the universe, electromagnets are pretty nifty devices. What's so great about magnetism on demand? We'll electrify you with the details in this article. See more »

  • How fMRI Works
    How fMRI Works

    What if a scan could not only help diagnose diseases of the brain, but maybe even determine what we're thinking and feeling? A noninvasive fMRI test could do just that. See more »

  • How Gyroscopes Work
    How Gyroscopes Work

    Did you know that airplanes and space shuttles use the utterly low-tech gyroscope for navigation? Discover the secret behind gyroscopic motion! See more »

  • How LED Incapacitators Work
    How LED Incapacitators Work

    This nonlethal weapon doesn't cause any lasting damage, but it may cause you to pray to the porcelains gods if an officer shines one in your eyes long enough to subdue you. See more »

  • How Millimeter Wave Scanners Work
    How Millimeter Wave Scanners Work

    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? See more »

  • How MRI Works
    How MRI Works

    An MRI scan is the best way to see inside the human body without cutting it open, but that may be little comfort to you when you're getting ready for the exam. Lying perfectly still on a tiny slab in a narrow hole, you might wonder what's happening to your body. See more »

  • How Prosthetic Limbs Work
    How Prosthetic Limbs Work

    Your body is a remarkable piece of biological machinery, and your limbs are no exception. Did you ever wonder how prosthetic limbs are made and how they are controlled? And are scientists developing bionic artificial limbs? See more »

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