The Wright brothers aren't the only siblings to push the limits of flight: In 1986, pilot Dick Rutan flew nonstop around the world, spending nine days in the air on a single tank of gas. He made the trip in a plane called Voyager, which his brother, Burt, designed. Today he's still at the forefront of aviation, busy building a new hyper-efficient engine and reimagining what aircraft might be.

In his own words:

Burt and I were issued flight plans instead of birth certificates. When we flew Voyager nonstop around the world, we showed that you could build a light, strong plane out of carbon fiber that will last indefinitely. Now we're at the dawn of learning how to fly into space—in planes. Burt designed SpaceShipOne, which won the Ansari X Prize. Its successor, Virgin Galactic's SpaceShipTwo, is on track to send civilians into space.