Amazon.com description: Product Description: If you think go-karts are just a fun leisure activity, prepare to be amazed. Kart racing has been a competitive motorsport around the world since the 1950s. Kids and adults alike can race these tiny, yet powerful vehicles, on dirt and asphalt tracks. The most powerful racing karts today, known as superkarts, can speed along at close to 160 miles (257 km) per hour! Some top race car drivers, including Michael Schumacher and Tony Stewart, got their start in kart racing when they were kids. Informative text is paired with stunning photographss of karts racers in action.