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Mexico Guadalupe Álvarez (right), 24, and Muriel Holzer, 25, members of the bicycle collective Rueda Libre, or Free Wheel, repair and assemble bikes at the collective's workshop in the city of San Cristóbal de las Casas, Chiapas state, Mexico. "Many people are surprised, and they ask us if we know how to fix bicycles or not," Álvarez says. "Fixing bicycles is not something from another world. We're capable of using tools, inflating tires."