I N A CAR PARK on the outskirts of Bristol in south-west England, security is unusually tight. Anti-crash barriers block the entrance to a fenced compound bristling with cameras and barbed wire. At night two dog units patrol beneath a pair of large black gates. “We call them Jurassic Park gates because they look like there should be a Tyrannosaurus or something behind here,” says Simon McIntosh-Smith, a professor at Bristol University, as the pistons hiss open. Behind them is no dinosaur, “just a supercomputer”.

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