Are Pigeons Smarter Than They Look?

Sure, they nuzzled their way into Mike Tyson's heart (and Nikola Tesla; and Bert from Bert and Ernie!), but how intelligent are pigeons? Have scientists really trained the birds to read? Did they actually play a role in discovering the Big Bang?  And why are they so darn good at finding their way home? Plus: are catfish their new nemesis?