Why do we have sex?

Why do we have two sexes, and not 5 or 500?

Why do we give birth and why do we die?

In the last 20 years a new body of evidence has emerged to get us closer than ever to answering some of our most fundamental questions.

What questions do we ask next?

Dr. Nick Lane is a biochemist and Author of The Vital Question: Energy, Evolution, and the Origins of Complex Life

First Aired: 19 September 2015