Chad Pregracke has made it his life's work to clean up the Mississippi River and other American waterways. Video | Photos | Tribute

In the past 15 years, Chad Pregracke has helped pull more than 67,000 tires from U.S. waterways. But that's just scratching the surface. Full story

Want to get involved? Check out the Living Lands & Waters website and see how to help. Get involved | Support the cause

They've been romanticized in movies and songs, but many people really do send messages in a bottle. Chad Pregracke has found 64 of them. Q&A