The energy in a slice of pizza is enough to move an automobile 100 feet. That same pizza slice will take you 3 1/2 miles if you're walking, or 10 miles if you're riding a bike. Special thanks to Transportation Alternatives.

Also, according to the late Ken Kifer of www.KenKifer.com, the total cost to you and to society of traveling one mile by car or by bike comes out to 93.8 cents for a driver, but only 12.8 cents for biking.