What started as a bet in the '30s has evolved into the Shell's Eco-marathon. The competition challenges high school and college students to engineer the fuel-efficient vehicles. And at this year's Shell Eco-marathon Americas, two teams will be representing Houston.

Students from Rice University and James E. Taylor High School are competing in the Shell Eco-marathon Americas, which begins April 3 and wraps up April 6. This year's competition is being held at Sonoma Raceway in Sonoma, California, and will include more than 90 teams from high schools and colleges throughout North and South America.

That's a far cry from the competition's origins. Shell's first fuel efficiency competition took place in 1939, when two Illinois scientists struck a friendly bet over who could engineer a vehicle that ran the furthest on a gallon of gas. The company held an employee competition that year and, save for around a decade and a half in the '70s and '80s, the competition has been held in some capacity every year.

"We really needed to get more young people interested in technology careers," says Pam Rosen, general manager of the Shell Eco-marathon. "It [doesn't] even need to be with Shell. It's more about the method, science, and helping [students[ gravitate toward those opportunities."

The Shell Eco-marathon has adapted with the decades. Students design vehicles that run on gas, diesel, and biofuels, as well as batteries and electricity. Vehicles fueled by GTL (gas-to-liquid) and hydrogen have also competed in the Eco-marathon, Rosen says.

"It kind of ebbs and flows toward what we see the automotive manufacturers trending toward," Rosen says.

The teams from Rice University is a returning presence to the Eco-marathon, while the team from James E. Taylor High School is competing in the Eco-marathon for its first time. Both teams engineered battery-powered electric urban concept vehicles, Rosen says, and describes "urban concept vehicles" as being similar to Smart cars.

The team that takes the top prize in the Americas' urban concept vehicle competition will compete in the Eco-marathon's regional qualifiers in London. As for the lucky winner? They'll head to Italy, where they'll get to drive their vehicle on the racetrack used in the San Marino Grand Prix in Marino, Italy, Rosen says.