AUDACIOUS UDACITY: You've got to admire the spirit: Sebastian Thrun, cofounder of the all-free university program Udacity, is encouraging high school kids take part in the Udacity challenge: namely to see who can recruit teams to take and complete the most Udacity classes by the end of the summer (August 28). The leaders of the five teams that accumulate the most points will win an all-expenses paid tours of Stanford, personally conducted by Sebastian. We hear he's also hoping for a new personal best by topping the 160,000 enrollments in his AI class with this new summer class on statistics. (Lectures begin June 25.) We're not sure how to calculate those odds--but we might be able to do that by the end of the summer!