In May of 1954 Roger Bannister broke the 4 minute mile. For all of the years leading up to this it had never been accomplished. Doctors said it was impossible. They said it could not be done. They said the human heart would explode with the amount of oxygen needed to perform such a deed. In today’s episode we talk about flea trainers. What does this have to do with Roger Bannister. Tune in and find out.