Since Philadelphia is arranged on a grid system, the mostly one-way roads are easy to navigate. Helpful maps are posted along street corners across the city – watch for the "Walk! Philadelphia" signs ...
The second-largest city in the Lone Star state, San Antonio is located on the southern edge of the mountainous Texas Hill Country. Its streets follow old Spanish trails and 19th-century wagon trails ...
Muscular dystrophy (MD) is a group of genetic disorders that damage muscle fibers and cause progressive weakness. Multiple sclerosis (MS) is an immune-mediated disease that affects the brain, spinal ...
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