TechnologyGoogle and NASA team up to use quantum computer New big-name clients for quantum-computer maker D-Wave may signal that their devices are going mainstream – but are they really that fast? ¿ìè¶ÌÊÓÆµ
SpaceBlack hole firewall: Trouble on the edge The problem that Stephen Hawking spotted around black holes has made a fiery return. Anil Ananthaswamy reports on how it threatens quantum theory and gravity Features