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Long live the qubit!

The power of quantum computers depends on keeping them in a fragile quantum-mechanical state — which researchers have found a new way to extend.

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Finding an edge

An algorithm for identifying the boundaries of objects in digital images is 50,000 times more efficient than its predecessor.

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Facing the future

Wael Ghonim, the Google executive and lauded online activist behind Egypt’s democracy movement, urges ‘action’ during a time of uncertainty.

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