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image: What the Sun Does to Photoreceptors

What the Sun Does to Photoreceptors

By | August 16, 2017

Optometrist and eclipse-chaser Ralph Chou describes how even a partially eclipsed sun can damage the eye.

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image: Light Scattering Varies Among Corals

Light Scattering Varies Among Corals

By | July 13, 2017

A new study reports which types of corals make the most of the sunlight they receive. 

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image: Next Generation: Nano Sunblock

Next Generation: Nano Sunblock

By | September 28, 2015

A new nanoparticle-based sunblock is effective, long-lasting, and may eliminate absorption of potentially harmful chemicals into the skin and bloodstream, a mouse study shows.

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image: Light Lowers Blood Pressure

Light Lowers Blood Pressure

By | January 20, 2014

UVA exposure reduces human blood pressure by releasing nitric oxide metabolites from storage in the skin.

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image: Dung Beetles Navigate by Sunlight

Dung Beetles Navigate by Sunlight

By | January 7, 2014

Shortly after demonstrating dung beetles’ ability to navigate by the stars, researchers in Sweden provide evidence that the insects can also use the sun to find their way.

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image: Electric Lights Alter Daily Rhythms

Electric Lights Alter Daily Rhythms

By | August 6, 2013

Humans’ circadian clocks become skewed when they are exposed to electric lights but revert to a schedule more in tune with the sun when they go camping.

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Inside the mind of Fritz Kahn

By | February 1, 2011

For more than 40 years, German gynecologist and legendary science writer Fritz Kahn (1888-1968) captured the imagination of an international audience with hundreds of wildly inventive illustrations and more than a dozen popular science books. 

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image: Light Therapy, circa 1939

Light Therapy, circa 1939

By | February 1, 2011

Around the turn of the 20th century—before sunscreens hit the market and the damaging effects of UV radiation were widely appreciated—physicians saw the sun mostly as a source of healing. 

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