There are very few things we seem to know with certainty. Among them is the fact that one day we will die. But why do we all die? Are we genetically programmed for senescence and death? Or is it simply the inevitable result of the accumulation of microscopic cellular wear and tear? Although we all have one lifetime, do we all experience the passage of time at the same rate, or does our age and lifestyle influence that perception?People have been searching for an elixir of life or a fountain of youth for milennia. The realization and dread of our mortality may be a significant part of the answer to why religious belief has evolved, and science may finally be close to discovering ways to prolong our existence. In this third episode of his documentary series on Time, theoretical physicist Michio Kaku explains and reveals some amazing scientific developments that were once only the stuff of dreams.
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