A German surgeon operates using VR goggles, a stutterer learns to speak more fluently using an online app. How digital is the future of medicine? Also: a drug to fight a dangerous virus, and could there be a complete polar reversal?
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Fake and adulterated foods are an extremely lucrative business, but now a genetic fingerprint technology might help catch frauds more quickly. Also: algae as a meat substitute, and the reinvention of the gearbox.