TechnologyBack to black: The enduring quest to portray nothing A painting of a black square shown in Russia 100 years ago broke new ground, now revisited by an exhibition in London and a carbon nanotube take on the original CultureLab
EarthOver a barrel? Falling oil prices and the environment A halving of oil prices is hailed as good news for cash-strapped consumers. But there could also be unexpected gains for the environment, says Fred PearceComment