my local pb station whyy philadelphia recently show the elegant universe . after three hour of watch it and besides have my brain hurt and i learn all about wormhole and quantum mechanic and parallel reality and alternate universe . the last hour of the show be about string theory physic and a semi new branch of physic which make many of the the idea of science fiction not only possible and but probable . with the string theory it sound like wormhole and alternate reality and alternate timeline be possible and it could just be a matter of time until we get the knowledge to use them . although it may not have give new information to someone familiar with the topic and i find the show very interesting and informative . it be very understandable to anyone who be just be introduce to this subject .