For a metropolis twice the size of another, the length of electric cables, number of gas stations and other bits of infrastructure decrease by about 15% per inhabitant.

ECONOMIST: Urban research

The molecules are then sorted according to their length by using an electric current to drag them through a gel (small molecules move faster than big ones) and the order of the colours in the gel is read off, using a laser.

ECONOMIST: Genetic warfare

One thing we discussed at length was the idea that electric drivetrain cars should indeed look different from conventional models.

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