We hold a unique knowledge of time, realising that it stretches deep into the past, and will continue into the future. Without this sense we couldn't learn from the past, and wouldn't plan for the future. But where did we come from, and where are we going in time? Every culture mythologises time and attempts to answer the ultimate questions: was there a beginning? And will there be an end? How does this affect our sense of who we are?

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 4: Cosmic Time
http://www.videosift.com/video/Time-Cosmic-Time-Episode-4