EnvironmentPlastic bottles dumped in rivers can travel thousands of kilometres Tracking the movements of plastic bottles released along the Ganges river shows they can travel as far as 3000 kilometres in less than 100 days. News
HumansHow many house plants do you need to clean the air in a small flat? There are lots of claims that house plants filter the air, but it turns out you need an awful lot of them to beat just opening the window, finds James Wong Comment