The new $100 bill has a not-so-secret weapon

[koalabear]

A blue ribbon woven into the note's fabric is supposed to block overseas counterfeiters who have become very good at producing fakes.

http://money.msn.com/now/post.aspx?post=f0847c65-87d5-4821-a7d4-ac2eb36757e2

 

[Colonel Hogan]

The best evidence that a $100 bill is counterfeit is if its pulled out of your wallet or mine.

 

[Sean]

European banks typically won't exchange American $100 bills because there are just SO MANY snides out there.