July 28, 2014
A fascinating presentation from NASA TV.
Though nobody at NASA is supposed to say so, this is an excellent argument for why manned space flight is an (almost) total waste of money. Russia charges $70 million a head for its ISS taxi service. NASA could finance a Europa mission for the cost of shipping a couple of astronauts to the ISS.
For the price of the ISS itself, NASA could have sent 100 Volkswagen-sized Curiosity rovers to Mars. All of the truly useful people at NASA work at JPL.