Elon Musk of SpaceX: We can put a human on Mars in 10 years

The Wall Street Journal's Alan Murray interviews Elon Musk of Space Exploration Technologies Corp., better known as SpaceX. Musk says his company plans to send a manned craft to space in three years, but that "we're going all the way to Mars. Best case, 10 years, worst case, 15 to 20 years."