Aron Ralston has faced so much adversity in ... But things went awry when a boulder Ralston had stepped on came loose, causing him to fall to the bottom of the canyon and wedging his right arm ...

When hiker Aron Ralston found himself trapped in a Utah canyon with an 800-pound boulder crushing his arm, he was forced to make an agonizing choice: to cut his arm free with a dull pocketknife ...