Some Hyundai vehicles also contain ultrasonic sensors that help drivers to park by measuring the distance between a car and other objects.

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Commercial trials are under way on Affectiva's skin-conductance sensors, wristwatch-size devices that detect emotional engagement by measuring tiny changes in sweat-gland activity.

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The system consists of sensors fitted on cables throughout the network, both overhead and underground, measuring current and conductor temperature.

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HITS, in which six sensors are placed inside the helmet of every player on the field, measuring the force and location of every blow he receives to the head.

NEWYORKER: Offensive Play