Dr. Michio Kaku Explains The Science Of 'Back To The Future'

Dr. Michio Kaku, Professor of Theoretical Physicist at the City University of New York, makes an appearance in the special features of the new Back to the Future Blu-ray set explaining the science behind time travel and how Back to the Future is one of the only movies to get it right — more specifically, sticking with the "River of Time" theory. Watch the clip embedded after the jump.

Here is the clip from the Back to the Future special features:

This isn't the first time Dr. Kaku has talked about Back to the Future. In July 2010, CNN interviewed the theoretical physicist about the science in Back to the Future II. Watch the clip below: