Anyone wondering what I'm talking about start here:
The Psychology of Persuasion
Just a comment on the Islamic extremists angle that's being pushed. While it remains a possiblitly, I think any such conclusions are highly premature.
Tamerlan appears to be a Muslim (possibly devout), but Dzhokhar doesn't appear to be overly religous or political. Furthermore, the Boston Marathon isn't the kind of target one would expect a Jihadist to attack. It's just hard to guess at a rational motivation from the information we have so far.
Semper Fidelis, Semper Liber.
Stolen fair and square from the Capt. Courtesey himself.I spit at lots of people through my computer screen. Not only does it "teach them a lesson" but it keeps the screen clean and shiny.