terrorism

In 2006, a bunch of terrorists went ahead and ruined air travel for the rest of us. After the terrorists failed to bring liquid explosives onto a British flight, the airlines banned liquid carry-on items larger than 3.4 ounces. This forced us to leave shampoo at home and buy outrageously overpriced drinks by the gate, to say nothing of the flask of whiskey I liked to travel with.

At 8 a.m. on May 4, 2001, anyone trying to access the White House Web site got an error message. By noon, whitehouse.gov was down entirely, the victim of a so-called distributed denial-of-service (DDoS) attack. Somewhere in the world, hackers were pinging White House servers with thousands of page requests per second, clogging the site. Also attacked were sites for the U.S. Navy and various other federal departments.

Congress held a hearing yesterday on the potential influence of Second Life and other virtual worlds, complete with a screen that showed avatars following the event from that increasingly popular alternate reality.

A few lawmakers showed off their own avatars, including Rep. Ed Markey, pictured here, and experts talked about the benefits of these virtual world—nonprofits, for example, are using them as a way to raise funds and fight for their causes.

See the photo gallery for an illustrated look at a creepy new line of defense

Sounds too futuristic to be true? See below for a video of the Skyguard system taking out mortar rounds, artillery shells and rockets

The future of secure travel hinges on seamless, instant communication-and 24/7 autonomous surveillance. For a look at the technologies that will soon safeguard your travel plans, launch the photo gallery.