The whole story is about change. We are very lucky that the earth's history is recorded in fossilized remains. And we can see the changes. Unfortunately, there will always be gaps in our knowledge, but there is no doubt that we and everything living today has evolved.

To have arrived on this earth as a product of a biological accident, only to depart through human arrogance, would be the ultimate irony.

My father used to say that, through culture, humans effectively domesticated themselves.

Echoing the criticism made of his father's habilis skulls, he added that Lucy's skull was so incomplete that most of it was 'imagination made of plaster of Paris', thus making it impossible to draw any firm conclusion about what species she belonged to.

When out fossil hunting, it is very easy to forget that rather than telling you how the creatures lived, the remains you find indicate only where they became fossilized.

Climate change: We have never faced a more critical time on our planet

It occurred to me that if I did not handle the crash correctly, there would be no survivors.