Curious what's in your tap water? Check out the Environmental Working Group's new Tap Water Database.
How bringing clean water to those in need helped Scott Harrison reclaim his life and find greater purpose.
World traveler Tyson Mayr crusades for clean water in the Third World — and proves that simple acts can make a big difference.
Find out about this Olympian's heart for helping others, and how she uses her training to keep her instincts sharp.