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Amazon has bought Liquavista, a company that makes 'electrowetting' colour displays.
Start-ups backed by the National Science Foundation will be showing off a wide range of technologies, including virtual reality contact lenses, robot butlers, and flexible displays.
Researchers say new tech can generate more than enough electricity to power a light bulb and charge a laptop, all from a walk around town.
Liquavista's full-color e-reader appears to be aimed squarely at magazine and newspaper reading.
French company Varioptic sells mobile phone camera modules whose lenses focus using oil, water, and electrical voltage.