# Science | Engineering | 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 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.

Can drones be used in construction?

Are drones appropriate for construction? Find out how some drones are helping builders monitor construction projects at HowStuffWorks. See more »

What's a Cybathlon?

The Cybathlon will showcase talented parathletes and the advanced robotics that can assist them. Learn more about the Cybathlon at HowStuffWorks. See more »

How Zambonis Work

Zamboni machines have been smoothing the ice for decades. Learn how Zamboni ice resurfacing machines work at HowStuffWorks.com. See more »

How Millimeter Wave Scanners Work

Millimeter wave scanners are often used in airport security. How exactly does the millimeter wave scanner device produce your image? See more »

What's the difference between backscatter machines and millimeter wave scanners?

What's the difference between backscatter machines and millimeter wave scanners? Learn about backscatter machines and millimeter wave scanners. See more »

Why isn't the U.S. on the metric system?

Why isn't the U.S. on the metric system? Learn about the reasons the United States has been slow to adopt the metric system. See more »

How the Metric System Works

The metric system is used around the world as a uniform measurement system. Learn how the metric system works at HowStuffWorks. See more »

5 Things You Didn't Know About the Metric System

The metric system is used in most of the world, and it's easy to see why the system caught on. Learn 5 things you didn't know about the metric system. See more »

Metric System Quiz

The metric system is used all over the world. Test your knowledge with this metric system quiz. See more »

Rock You Like a Hurricane: The Ultimate Wind Tunnel Quiz

Wind tunnels are the unsung heroes of aerodynamics. Test your knowledge of wind tunnels with this quiz. See more »