Mr Musk's company SpaceX has brought down the cost to orbit by a factor of three. That's a big deal. Not as big as Edward Jenner & Louis Pasteur (vaccines) or

Mr Musk's company SpaceX has brought down the cost to orbit by a factor of three. That's a big deal. Not as big as Edward Jenner & Louis Pasteur (vaccines) or Isaac Newton, but still pretty big.