TechnologyGoogle's quantum computer flunks landmark speed test In its first head-to-head test against a PC, the D-Wave Two showed no quantum speed boost – but it is being used in blink-detection and planet-hunting ¿ìè¶ÌÊÓÆµ
LifeKalahari trackers who read ice-age life in footprints Generations of archaeologists puzzled over ice-age footprints in French caves – but these three men can read them like a book Features