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It works without a battery. He follows the sun.
Scientists have created a very small, flexible and battery-free sensor, able to track how much sunlight a person feels in a sunny atmosphere.
The device, which does not exceed the size of a coin, has wireless features that allow users to see data on the amount of ultraviolet radiation through the smartphone.
High exposure to ultraviolet rays increases the risk of skin cancer, but the new device determines the amount of sunlight needed to be exposed.
Although this is done under certain therapeutic conditions, the study was recently published in the journal Science Transcendental Mediation.
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