The quality that accompanies the emergence of learning in the evolution of higher animals, namely intelligence, is surprisingly difficult to define. - Richard Leakey

Next to the discovery of the Turkana boy, the visit to Lascaux ranks as one of the great moments of my life.

Because the art of Africa was on rock shelters, not deep in caves, as in Europe, the ravages of time have eroded most of a rich expression. What we now see is the merest glimpse of what was on the minds of these people.

I do not believe in a god who has or had a human form and to whom I owe my existence. I believe it is the man who created God in his image and not the other way round.