They can carry five to 20 times more current in the same unit area while reducing the amount of energy lost as heat by 75-97% (depending on whether the current is alternating or direct), even after accounting for all the nitrogen-cooling paraphernalia.

ECONOMIST: Inside story

Water-cooling of this sort could also make a more direct contribution to the reduction of greenhouse-gas emissions, by promoting the use of solar energy.

ECONOMIST: Monitor