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Constructing a tunnel is one of the most complex challenges in the field of civil engineering. Learn about the basics behind tunnels.

Elmo, the furry red Muppet on 'Sesame Street,' is the most recognized children's character in the United States. Read this in-depth look at Elmo.

Although often overlooked, the 1962-1964 Ford engines were a powerful bunch. Learn about the 390 Thunderbird Special and other Ford engines.

Build your own furniture with just a few materials and these easy-to-follow instructions. Create a bookcase, desk, telephone stand or plant stand.

I have both a pager and a cell phone that vibrate instead of ringing when I get a call. How does that work?

Someone started controlling my computer over the Internet -- what happened?

The 1955 Harley-Davidson FL Hydra-Glide motorcycle offered a host of chrome options. See pictures and learn about this Harley-Davidson motorcycle.

The 1959 Harley-Davidson XLCH Sportster was lighter and faster than its sibling XLH. See pictures and learn about this Harley-Davidson motorcycle.

The 1971 Harley-Davidson XLH Sportster was offered in a patriotic red, white and blue paint scheme. Learn about this Harley-Davidson motorcycle.

The 1986 Harley-Davidson XLH 1100 introduced the first changes to the Sportster in thirty years. Learn about this Harley-Davidson motorcycle.

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