Another possible purpose: “It appears that opsins signal melanocytes to make more melanin in response to UV exposure,” saysDr. Shamban. As we learn more about how light, in all its wavelengths ...
First came fire; then oil lamps, candles, and gaslight; and, finally, Thomas Edison’s incandescent bulb, which operates by heating a filament until it glows. The light produced by an ...
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