Happy Sesame Street Day!  It premiered 56 years ago on November 10th, 1969.  So most Americans living today watched it as kids at some point.     The PBS charity Next Avenue did a list a while back of "Sesame Street" lessons adults should never forget.     1.  Put down the ducky if you want to play the saxophone.  (???)  There was an old episode where Ernie wanted to play sax, but wouldn't let go of his rubber ducky.  Translation:  Don't take on too much.  If you want to try something new, you might need to leave something behind for [...]