In a two-story building in an industrial district of Cambridge, Massachusetts, Ara Knaian shows off prototypes of what could be the industry’s first completely modular smartphone.

On workbenches sit prototypes of memory modules, battery modules, and processor modules, all designed to slide easily in and out of an aluminum smartphone “endoskeleton.” A prototype infrared imaging lens module for night photography would protrude about a half-inch from the device. Another module would let you read your blood oxygen levels with a swipe of your finger.

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