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Summary: In this short video, Michio Kaku, theoretical physicist from City College of New York, discusses the reality behind the theory of time travel. Dr. Kaku states that there really is no law preventing time travel and describes how Einstein likened time to a river, which may fork, or have whirlpools, or even bend. He gives the example of time travel with a wormhole defining it as a shortcut between two points in time using Alice in Wonderland's Through the Looking Glass as a potential example of a wormhole. Quality: Educated at University of California Berkeley and Harvard University, Dr. Kaku is the Henry Semat Professor of Theoretical Physics at City College in New York. He has written numerous books, appeared on TV shows and been included in a variety of documentaries. He shares concepts of physics in ways lay people can understand using examples to which high schoolers can relate. It would be a nice tie-in to have the high school English class read Alice in Wonderland's Through the Looking Glass and then discuss the physics of the story in science class.

Summary: Put out by NASA's Glenn Research Center, this website discusses what we know and don't know about science as it relates to the implications of time travel. What we know at this point in time (no pun intended), is that faster than light travel is not possible. The site also mentions other theories such as wormholes and quantum paradoxes, which have not been proven yet as viable options. The site adds that time travel is considered far more impossible than light travel. Quality: Having been complied by scientists at NASA's Glenn Research Center, this website is thorough and credible in its discussion of the possibility of time travel and the applicable Rules of Special Relativity. The site also includes some graphics to aid in understanding the basics of Special Relativity and links to other NASA related topics for further study.