Science | Transportation | Engines & Equipment

Engines and construction equipment are all complex machines. How do some of these engines work, and how do they help us construct buildings and structures?

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What's the Segway recall about?

Segway Inc. announced on Thursday that it's recalling all of the scooters it has sold since the Segway went on the market in 2002.


How Gear Ratios Work

How Gear Ratios Work

You see gears in just about anything that has spinning parts -- car engines, transmissions, VCRs... Learn what these gears are doing and get to the bottom of the "gear ratio" concept! See more »

How Gears Work

How Gears Work

Gears are a fundamental part of just about any mechanical object -- if it has a motor, engine or spring, it probably has gears! Learn dozens of fascinating facts about gears! See more »

How do they get the balls in ball bearings so perfectly round and smooth?

How do manufacturers get the balls in ball bearings so perfectly round and smooth? See more »

What is a punkin chunkin?

What is a punkin chunkin?

A punkin chunkin is explained in this article. Learn about a punkin chunkin. See more »

How Maglev Trains Work

How Maglev Trains Work

Magnetic levitation trains are becoming a popular transportation topic all around the globe. Learn about electromagnetic suspension, the most popular type of maglev train. See more »

How Bearings Work

How Bearings Work

Bearings are the invisible heroes inside many mechanical devices. Learn about all different kinds of bearings. See more »

How Submarines Work

How Submarines Work

Submarines are essentially containers that hold people and air. Learn how these remarkable vessels dive, surface and maneuver through the ocean. See more »

How do torpedo engines work under water?

Since a torpedo cannot have an air-breathing engine like a boat, how is it propelled through the water? See more »

How does a catapult work?

How does the ancient catapult work? It doesn't seem like twisted rope and wooden gears or levers would be able to get up the speed to launch heavy loads a great distance. See more »

How does a water-cooled air conditioner work?

How does a water-cooled air conditioner work? See more »