In Brief

This year’s Consumer Electronics Show included everything from manned drones and Segway robots to personalised coffee foam imprinters. Apparently 700,000 to 1 million unmanned aircraft were expected to be given as gifts in the United States last Christmas. Photo-excited quantum dots have been used in experiments to kill drug resistant bacteria. Congratulations to Curtis Cooper for discovering the world largest prime number, a mere 22, 338, 618 digits.