Which discoveries have had the biggest impact on the world in the last 50 years?

New Scientist is conducting a poll for the EPSRC of the most important discoveries in physical science and technology. The MCR doesnt seem to make the list (must have been number 11). Ten eminent scientists propose their picks have changed the world more than any other. You can vote for your favourite of the ten, or suggest an alternative discovery at http://www.newscientist.com/special/big-impact