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Jon Krakauer's book Into the Wild is now a film directed by Sean Penn. It's getting good reviews.
It's the story of a kid who goes to Alaska to live in the wild, kinda like Thoreau. His experience and judgment though, did not match his "back to nature" ambitions.
I always thought the book was interesting, but never could quite could figure out the real motives of Chris McCandless. Here's a link to the original Outside Magazine article from 1993.