Every science fiction fan has pondered the weird implications of time travel. Can you travel into the future and find out the winning Super Lotto number -- then come back and buy a ticket? Would doing so be cheating the laws of physics (to say nothing of ethics?) Astrophysicist Marc Rayman toys with such ideas in this Space Place Musings Podcast. Go to http://spaceplace.jpl.nasa.gov/en/educators/podcast/ to subscribe to these Podcasts. Or listen now to this and the previous Podcasts on your computer or read the transcripts.