The A160 hummingbird, just one of many DARPA project that have found military or commercial use (Image: DARPA)

ON 6 December 1957 a hollow aluminium sphere the size of a small melon burst from a blazing fireball, rose a mere metre or so above Florida before landing with a thump. The US was in trouble. A month earlier, the Soviet Union had sent a 500-kilogram capsule bearing a dog called Laika into space. But here was the US unable to even notch up its first foray into orbit.

President Dwight Eisenhower responded by creating a new research agency tasked with …