Carnegie Mellon University researchers have made electronic devices into their own mouses. Using two optical sensors, the new device can attach on to cellphones and ipods with touch screens to perform the the functions a finger normally would have difficulty doing... highlighting, moving through screens, etc. It uses common technology so it would be cheap and easy to duplicate... many of these could be available in the near future! I would love to keep my fingers off my screen to not obstruct my view!
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