forums talking about mythbusters and the 21 foot rule

http://www.northeastshooters.com/vbulletin/threads/163429-Uh-Oh-Mythbusters-is-going-to-test-the-quot-21-foot-rule-quot

http://www.survivalistboards.com/showthread.php?p=4255420

http://community.discovery.com/eve/forums/a/tpc/f/9401967776/m/74119120111/r/30219720111

http://www.usacarry.com/forums/general-firearm-discussion/26578-mythbusters-bringing-knife-gun-fight.html