PHYSICS
Found: cosmic graffiti Stephen Hawking’s initials are written into the cosmic microwave background. Find more in our interactive graphic
GALLERY
The UK’s secret sites Our dossier of some of the UK’s most sensitive government sites, from the erstwhile venue of gruesome human experiments to eavesdropping stations
TECH
Super-strong nanopillars How to make a brittle metal alloy stronger and ductile by cutting it into tiny barbell-shaped pillars
TECH
Intelligence in your pocket Our reporter spends a week with an “artificially intelligent” assistant installed on his phone. Could he trust it with the important stuff?
