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Using nanotechnology to detect cancer cells spreading through the body, using a mechanical analysis. Why a bioengineer is building an artificial brain, neuron by neuron, called Neurogrid. Flying Fish, the first unmanned sea plane, is unveiled. The journal Science's top 10 breakthrough's of 2007 include human genetic variation and the quanum spin Hall effect. Why do we crave chocolate – do its psychoactive ingredients make it addictive?