There is no magic fairy dust protecting Macs - Dai Zovi, security researcher and co-author of The Mac Hacker's Handbook.
Courtesy of popularmechanics.comhttp://link.brightcove.com/services/player/bcpid932579976?bclid=932553050&bctid=933742930
The inside story on how it works:http://www.popularmechanics.com/technology/industry/4217348.html