EarthGlobal mercury treaty will take decades to work 140 countries have agreed a deal to cut mercury pollution, but it will be a long slow process getting the toxic metal out of the environment ¿ìè¶ÌÊÓÆµ
TechnologyThe wonder-working bubbles that physics can't explain Nanobubbles can revive polluted lakes, clean computer chips and might even make wonder drugs. Not bad, considering they shouldn't exist, says Michael BrooksFeatures