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 was readily available, black-and-white photography continued to dominate for decades, due to its lower cost.

Chasing the blonde dragon is still a genuine plight, because the grass is always greener on the other side, i.e., the other end of the hair color spectrum. And while Sun-In may not be the answer, not even the fair-haired who are just out for some highlights are immune to the moisture zapping.

3 Products You Need for the Sexiest Beachy Waves Ever

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3 Products You Need for the Sexiest Beachy Waves Ever

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