Our rubbish-disposal systems are burdened by a flood of outmoded computers, sound systems, radios and TV sets. How can they be recycled? DREADCO biologists are searching for strains of mould, cousins to those able to metabolize arsenical pigment in wallpaper to arsenic trimethyl, that can turn solder into a volatile mixture of methyl derivatives. In a special 'electronic compost heap', such moulds will disintegrate the joints of the appliances, resulting (hey presto!) in clean resistors, capacitors, chips and circuit boards ready for reuse.