We know that once we stop learning and call ourselves learned, we become useless members of the scientific society.

Due to these various circumstances, when I entered the Catholic University of Louvain in 1934, I had already travelled in a number of European countries and spoke four languages fairly fluently. This turned out to be a valuable asset in my subsequent career as a scientist.

Although attracted by the humanities, I had chosen medicine as a career, seduced by the image of the 'man in white' dispensing care and solace to the suffering. But science was lurking around the corner, in the form of an unpaid student assistantship in the laboratory of physiology.

Our investigations were very fruitful. They led to the discovery of a new cell part, the lysosome, which received its name in 1955, and later of yet another organelle, the peroxisome.

Liberating Iraq from a legacy of violence and putting it on the path to peace and prosperity will take time.

I don't feel the need to direct. I tried to get other people to direct Dances, but they wouldn't do it. They all thought it was too long. One director wanted to cut the Civil War sequence. Another thought the white woman was very cliched.

I was born and brought up near a village in Nottinghamshire and in my childhood enjoyed the freedom of the rather isolated country life. After the First World War, my father had bought a small farm, which became a marvelous playground for his five children.

We don't need a War on Carbon. We need a new prosperity that can be shared by all while still respecting a multitude of real ecological limits - not just atmospheric gas concentrations, but topsoil depth, water supplies, toxic chemical concentrations, and the health of ecosystems, including the diversity of life they depend upon.