Smartphones that can identify knuckle touch and fingernails

A computer scientist in the US has built a prototype smartphone that can distinguish between touches from the knuckle, fingertip and even fingernail.
To open up the smartphone screens to commands from other parts of the hand, Chris Harrison, from Carnegie Mellon University in Pittsburg, Pennsylvania, has built the prototype.
A modified smartphone, fitted with a small vibration sensor and running Harrison’s FingerSense software, listens for the acoustic and vibrational differences between the three different types of touch.

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