Pierce Hoover teaches his son Nash about conserving energy with a cross-country trip using the power of a single lightbulb, sponsored by Popular Science.

Nash Hoover with the chassis of the electric vehicle
How do you show your son that taking the time to turn off his room light - one single light bulb - makes a difference? If you're Pierce Hoover, you come up with a plan that involves traveling around North America in a vehicle that uses the same energy as a light bulb, bringing your 12-year-old son with you and getting Popular Science magazine and General Electric to sponsor the trip.