PHYSICS
Found: cosmic graffiti Stephen Hawking鈥檚 initials are written into the cosmic microwave background. Find more in our interactive graphic
GALLERY
The UK鈥檚 secret sites Our dossier of some of the UK鈥檚 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
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TECH
Intelligence in your pocket Our reporter spends a week with an 鈥渁rtificially intelligent鈥� assistant installed on his phone. Could he trust it with the important stuff?
ZOOLOGGER
The troglodyte bird of South America It鈥檚 a bird that thinks it鈥檚 a bat. The split personality of the echolocating, cave-dwelling oilbird makes it a particularly slippery specimen
SPACE
Pluto pics reveal a mottled world Pluto may take a whopping 248 years to orbit the sun, but its surface is changing at a much faster rate