Number 3: Pittsburgh It's not called the "Pitts" for nothin'. As the most polluted city in on this list, your hair will be calling Green Peace on a daily basis. Pollution has been known to cause premature balding, graying and dullness.
Find out when Tom Shadyac's documentary I Am comes to a movie theater in your town.
Even if you're traveling, celebrate the 40th anniversary of Earth Day with ample opportunities to help the environment.
A state by state list of facilities that can perform a 64-slice CT scan.
Read an excerpt of Jon Krakauer's book Into the Wild.
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