| Light transistor: Efficient transistor for light could lead to optical computers Jul 8th 2013, 14:29 Light can oscillate in different directions, as we can see in the 3-D cinema: Each lens of the glasses only allows light of a particular oscillation direction to pass through. However, changing the polarization direction of light without a large part of it being lost is difficult. Scientists have now managed this feat, using a type of light – terahertz radiation – that is of particular technological importance. | | A mathematical ranking classifies tennis players by assessing their play Jun 28th 2013, 13:19 Researchers have used mathematical techniques and the game statistics from the Association of Tennis Professionals (ATP) to rank tennis players based on assessing their play and thus complement the ATP ranking obtained on the basis of matches won during the competition. | |