The Apple Watch and Microsoft Band optical sensors to measure heart rate. The jawbone Up3, which instead tracks your resting heart rate, uses bioimpedance sensors serveral electrodes to measure your skin’s resistance to a small amount of electrical current. Originally, all photography was monochrome, or black-and-white. Even after color film […]

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The Apple Watch and Microsoft Band optical sensors to measure heart rate. The jawbone Up3, which instead tracks your resting heart rate, uses bioimpedance sensors serveral electrodes to measure your skin’s resistance to a small amount of electrical current. Originally, all photography was monochrome, or black-and-white. Even after color film […]

READ MORE