Tripping the light fantastic Among the many new gadgets unveiled at the recent Consumer Electronics Show in Las Vegas was a pair of smartphones able to exchange data using light. Li-Fi, a fast and cheap optical version of Wi-Fi, is coming.

Tripping the light fantastic Among the many new gadgets unveiled at the recent Consumer Electronics Show in Las Vegas was a pair of smartphones able to exchange data using light. Li-Fi, a fast and cheap optical version of Wi-Fi, is coming.

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