In the summer of 2011, photographer Alejandro Cartagena spent three mornings a week -- any more and his wife would have kicked him out -- hunched over the railing of a pedestrian footbridge crossing one of Monterrey, Mexico's busiest highways.
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When Dan had his stroke, his occupational therapist suggested that piano lessons would be beneficial for his brain and his motor skills.
Little measures -- recycling, driving a most fuel-efficient car, walking, biking or using public transit, and installing low-flow shower heads -- can make a huge difference.
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