The Heaviness of Light

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Most of us are hungry for light.   We crave sunny days and clear skies, we like big windows and well-lit rooms.  But some people have a more complicated relationship with light. John Merfeld, a physics student at Tufts University, has a genetic condition called albinism that renders his body unable to properly absorb light. It's made him acutely aware of its unique power, beauty, and danger.