UV light

Blue is an Elusive Color. One Artist Just Invented a New Shade.

Blue is an elusive color. Crush the feathers of a blue jay or the wings of a Morpho butterfly and you’ll see gray dust; our perception of their electric blue hue depends on microscopic structural features that bend the light just so. The blue sky is merely a mirage of refracting light, as are blue eyes. Truly blue pigments are exceedingly rare in the natural world, which is perhaps part of their allure—blue is our favorite color, according to an international, cross-cultural survey.

From the Winter 2019 issue of California.

Is Peeing in the Pool Dangerous or Just Gross?

For many swimmers, the bracing aroma of swimming-pool chlorine is assurance that pool water is free of disease-causing microbes.

Unfortunately, that summery smell may actually signal troublesome levels of urine, sweat, and body-care products in the water. And according to researchers, bodily fluids in pool water are worse than unsavory—they react with pool disinfectants, forming chemical compounds that may be hazardous to your health.

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