Cars

Day job: Golf cart repairs. Fantasy gig: Turning a dune buggy into a high-tech race warrior.

H2.0 assumes you are a professional driver on a legal track or safe private road.

They look like lawnmowers on steroids, but superkarts can keep pace with million-dollar Ferraris--150 mph on the straights and crazy Gs in the turns. The best value in racing is starting to get respect.

TransHab

Auto enthusiasts envisioned high-speed tankers that pumped on the go. The idea did not catch on -- except in the air.

What does it take to get a heavy, luxurioussupercar to 252 mph and back down to zero?

With the rutan-designed globalflyer, these adventurers tackle "the first great aviation challenge of the new century." Technology: cutting-edge. Risks: gigantic.

The 118 WallyPower is a wild, $24 million turbine-driven high-tech yacht that looks like it's built for special forces billionaires. Mission: Go fast, guzzle fuel, look scary.

At Bill Scott's anti-terrorist driving school, students learn to spin, shoot, and ram their way through any auto-borne attack.

Is it a good idea to turn the pleasure of driving into a barrage of beeps, flashes, cautions and commands? He thinks not.