Dr. Alison Woollard looks at why we die and how 'cell death' enables the development and survival of most multi-celled organisms from hedgehogs to humans.

Dr. Alison Woollard unravels the mystery of why evolution by natural selection has given such stunning diversity on our planet - the answer being by genetic mutation.

Alison Woollard reveals how the transformation from a single cell into a walking, talking, multi-trillion-celled organism we call the human body takes place.