The path, as the mystic poet Rumi writes, won’t appear until you start walking. William Herschel started walking, grinding mirrors, and reading astronomy-for-dummies books even though he had no idea he would discover Uranus. Andrew Wiles started walking when he picked up a book on Fermat’s last theorem as a teenager, not knowing where his curiosity might lead. Steve Squyres started walking in search of his blank canvas, even though he had no idea it would one day lead him to Mars. The secret is to start walking before you see a clear path.
