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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
How do viruses work? Sort of like an alien invasion that replaces our cell’s genetic code.
Humans are indeed genetically related to bananas (as well as slugs), but how exactly?
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.