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What makes a cheetah run so fast? Learn why a cheetah runs as fast as it does, and find out how cheetah anatomy allows it to reach top speeds.

Quartz watches actually use quartz crystals to keep time. How can they be so accurate? Find out why quartz makes such a great time keeper.

The Lockheed F-117A Nighthawk Stealth Fighter directly led to the success of the Persian Gulf War. Learn about this classic fighter airplane.

The 1960-1961 Plymouth Fury attempted to build on the success of late 1950s Fury models. See pictures and a profile of the 1960-1961 Plymouth Fury.

The 1965-1969 Excalibur Series I models represented a leap forward in auto engineering and design. Learn more about the 1965-1969 Excalibur Series I.

The 1965-1969 Buick Electra 225 was a stretch sedan fitted with fine fabrics and a choice of three Wildcat V-8s. Learn about the Buick Electra 225.

The 1968-1969 Dodge Charger was a high-powered car with tons of attitude. Learn more about the 1969-1969 Dodge Charger at HowStuffWorks.

The 1960 Mercury had a more subtle attitude than its predecessors. Learn more about the changes made to the 1960 Mercury and what engines were used.

A bathroom in space requires unique engineering that is different from a bathroom on Earth. Learn about the features of a bathroom in space.

Nails come in a variety of sizes to suit a variety of jobs around the house. Learn more about this handy fastener only at HowStuffWorks.

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