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Diamonds, well known for being utterly useless piles of carbon atoms, may in fact be good for something: flaws inside them have been turned into an operational quantum computer.
Quantum computers are just like regular computers in that they crunch numbers using zeros and ones. The difference is that quantum computers manage to crunch numbers using both zeros and ones at the same time, which is impossible. But, "impossible" doesn't really apply in the quantum universe, where things have no trouble being more than one thing at once.  More...