On May 20, investigators who had been casing the area noticed a light upstairs in the otherwise dark warehouse in Long Island City.

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Whereas tablet PCs are full-blown PCs that contain all their components inside the casing of a notebook-sized flat-screen display, smart displays are light, portable display screens that connect wirelessly to a PC, so a user can interact with the PC away from the desk for reading documents or surfing the Web.

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More than just supplying a battery-free source of light, though, the lantern can function as a charger, thanks to a USB port built into the casing.

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But Friend envisions a time when the casing of a handheld computer or telephone will have one organic polymer that soaks up a room's light and uses it to juice a battery, which then powers one of his hyperefficient OLED screens.

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