Three years ago, Toby Neugebauer, co-founder of Texas-based Quantum Energy Partners, and his family embarked on a 110-day trip around the world. Wealthy Britons had a long tradition of sending their children abroad to absorb some high culture and hobnob with the Right People in Paris and Berlin. But the Neugebauers were not remotely interested in giving their 9- and 11-year-old sons a 19th-century-style Grand Tour. No, instead of the Mona Lisa and Monte Carlo, they were taking ...