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36:51

Exploring 'The Hidden Reality' Of Parallel Worlds

It is possible that there are many other universes that exist parallel to our universe. Theoretical physicist Brian Greene, author of The Elegant Universe, explains how that's possible in the new book, The Hidden Reality.

20:36

'Physics Of The Future': How We'll Live In 2100?

Theoretical physicist Michio Kaku descries some of the inventions he thinks will appear in the coming century -- including Internet-ready contact lenses, space elevators and driverless cars -- in his book Physics of the Future.

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