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Time: Cosmic Time (Episode 4)

We've always structured our lives based on an unchanging past and a predictable and ordered future. But atomic and cosmic discoveries have changed all that. What is time itself? And will it ever end?

Throughout history, one thing has never changed - time. It is something we rely on to plan our lives, and it is consistent, regular and ceaseless. But is it? High in the Alps, Michio encounters a mystery - tiny particles called muons which shouldn't exist. They don't last long enough to be detected on Earth - and yet here they are. The answer to this mystery lies in one of the greatest discoveries of all time - Einstein's theory of relativity.

In this four-programme series, string theory pioneer Michio Kaku goes on an extraordinary exploration of the world in search of time.

He discovers our sense of time passing and the clocks that drive our bodies. He reveals the forces of time that make and destroy us in a lifetime. He journeys to some of the Earth's most spectacular geological sites to look for clues to the extraordinary depths of time at a planetary level. Finally, he takes us on a cosmic journey in search of the beginning (and the end) of time itself.

Source: http://www.bbc.co.uk/bbcfour/documentaries/features/time.shtml

Episode 1: Daytime
http://www.videosift.com/video/Time-Daytime-Episode-1
Episode 2: Lifetime
http://www.videosift.com/video/Michio-Kaku-BBC-TIME-Part-2-of-4
Episode 3: Earth Time
http://www.videosift.com/video/Time-Earth-Time-Episode-3

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