4 hours, 25 minutes
What is the force at the heart of life? What is the engine that drives it forward? That links all living things from the smallest to the largest, that links families through generations, looks, personality, health, and in sickness? The secret was DNA, a microscopic strand of only four chemicals but capable of such infinite variety that it carries the blueprint and directs the growth of every living thing on earth. The genetic revolution was about to begin.