Tree house design goes out on a limb.
Photo by TreeHouse Creations
TO THE MOUNTAINTOP
A team of black climbers blazes a new kind of trail on Mt. Denali.
Photo by Hudson Henry
Trevor Thomas went blind at age 36. He responded by hiking 18,000 miles.
Photo by Jake Abrahamson
Fracking divides Coloradans.
Photo by Aurora Open/SuperStock
How America's electrical grid could be free of fossil fuels by 2030.
Photo by Henrik Cam
Photos and illutrations, first row, from left: Jesse Lefkowitz; Peter and Martha Hoey; Lori Eanes.
Second row, from left: Jeffery Salter; Braden Gunem; PatitucciPhoto
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