Dean Kamen invented the Segway Human Transporter, a high-tech scooter. The scooter relies on sensors, sold-state gyroscopes, and softwear to produce a balanced ride even over rough terrain. $5,000. Kamen's other inventions include a portable drug-infusion pump, a compact dialysis machine and a wheelchair that can climb stairs. Kamen heads DEKA Research & Development Corporation in New Hampshire. The interview originally aired Feb. 10, 2003.