In our next summer replay, we hear from adventurer Erik Weihenmayer. Erik lost his vision at age 13, but he never lost his thirst for adventure. In the decades since, he has rock-climbed in California and ice-climbed in Antarctica. In 2008, he decided he wanted to kayak through the Grand Canyon. It was, as you can, imagine quite a ride.

Read more about Erik on his website, listen to his podcast, or follow him on Twitter. You can watch his documentary, The Weight of Water, on Amazon.