It's a bird... it's a plane... how the heck do either stay up in the sky like that?! Episode one of season two focused on birds using their legs to survive and thrive. This time around we've digging into the science behind birds greatest skill- flight! The brilliant Billy Valentine joins Will bringing with him years of experience working for one of the world's premier airplane manufacturers and insight into the physics behind the mystery of flying. The episode is centered around a maste...