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Part Two begins with the signature scientific achievement of our time.
Part One interweaves present-day stories with the discoveries of pioneers in genetics.
Extras
What terrifying things go on inside of chrysalis, and what dark role do genes play?
What goes on in our DNA to make us grow grey hair, wrinkles and less than healthy DNA?
How DNA's mysterious instructions buried in a gene become the actual nose on a face.
If you're curious about the origin of boys, look no further than the Y chromosome.
See what happens if DNA code gets deleted, put in the wrong place, or switched.
What causes cancer and ways to calm down those "good genes that have gone bad."
Take a peek into the body's war room during the heat of battle with cancer.
See how scientists are expanding the DNA alphabet & what to look for in the search for E.T
Nancy Wexler reveals that she has inherited the disease she has spent her life studying.