Tonight’s new installment of Nova is called “Bird Brain,” and looks at old and new studies of avian creatures to determine whether their intelligence has been collectively and individually underestimated. I’m guessing studies by Pavlov and Skinner, training pigeons to do simple tasks, will be part of this narrative – but don’t feel bad if those studies, and names, don’t ring a bell. Nova will explain it all for you, I’m sure. Check local listings.