It was because the chimps are so eye-catching, so like us and teach us so much that my work was recognised worldwide.
I think the most important thing is to keep active and to hope that your mind stays active.
I had been told from school onwards that the best definition of a human being was man the tool-maker - yet I had just watched a chimp tool-maker in action. I remember that day as vividly as if it was yesterday.
