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The experimental RF resonant cavity thruster, or ‘EMDrive’.

But by 1940, it was the British who had made a spectacular breakthrough: the resonant cavity magnetron, a radar transmitter far more powerful than its predecessors.

On a sabbatical to Harvard University in Cambridge, Massachusetts, in 1979, Drever learned about a method devised during the Second World War to stabilize the frequencies of microwaves for radar by reflecting them with a resonant cavity.

Experiments that use the resonant cavity technique, such as ADMX, are capable of discovering axions today.

Researchers had previously used living cells to fashion lasers by loading the cells with fluorescent proteins and placing them within a resonant cavity.