Why does Charles Darwin's ''dangerous idea'' matter more today than ever, and how does it explain the past and predict the future of life on Earth? The first show interweaves the drama of Darwin's life with current documentary sequences, introducing key concepts of evolution.

What underlies the incredible diversity of life on Earth? How have complex life forms evolved? The journey from water to land, the return of land mammals to the sea, and the emergence of humans all suggest that creatures past and present are members of a single tree of life.

Five mass extinctions have occurred since life began on Earth. Are humans causing the next mass extinction? And what does evolutionary theory predict for the world we will leave to our descendants?

Survival of the fittest: Raw competition? Intense cooperation? Both are essential. Interactions between and within species are among the most powerful evolutionary forces on Earth, and understanding them may be a key to our own survival.

In evolutionary terms, sex is more important than life itself. Sex fuels evolutionary change by adding variation to the gene pool. The powerful urge to pass our genes on to the next generation has likely changed the face of human culture in ways we're only beginning to understand.

Fifty thousand years ago, something happened -- the modern human mind emerged, triggering a creative, technological, and social explosion. What forces contributed to that breakthrough? Where might our power of mind ultimately lead us?

Of all species, we alone attempt to explain who we are and how we came to be. This final show explores the struggle between science and religion. Through the personal stories of students and teachers, it offers the view that they are compatible.