Advertisement

Outdoor Activities

Outdoor activities such as biking, climbing and hiking keep you active during the warmer months. Learn more about snow sports like bobsledding and the Iditarod to keep you moving this winter.

Topics to Explore

Advertisement

Learn More / Page 25

What causes 'the bends'?

'The bends' is a dangerous condition based on water pressure. Find out how you can get -- and prevent -- the bends.

How Bicycles Work

Lance Armstrong has won yet another Tour de France, breaking the cycling record for consecutive victories in that race. Bicycles are incredibly simple machines, and the "inner" workings are right out in the open for you to see. Find out how all those

How Compasses Work

Long before GPS satellites and other high-tech navigational aids, people used the Earth's natural magnetism to navigate the unknown. Learn how a compass works and how to create your own!

Advertisement

Advertisement

Advertisement

Advertisement