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Up to about 130 years ago we had no artificial light and the only light came from the sun, the moon, and the fires we lit. Nowadays there is almost no place on earth where there is not a single artificial light. Artificial light has brought the human life far and we would not be able to live without anymore. However all that light has adverse effects as well for our biological clock. We produced light sources that prevent the disruption of the biological clock.
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