The good news is world population growth rate decreases systematically and is expected to reach zero by 2050, thanks to urbanisation and women's education.

The frontiers of science, on the very small scale and very large scale, require large investments and international effort.

I see the root of the education crisis in the primary and secondary schools. Academia is doing a fairly good job. The root of the problem is the teachers. Some are great. But too many of them are not capable of being good role models. They can't control the classes. They lose too much time trying to create a learning environment.

My childhood dream was to study mechanical engineering. After reading 'The Mysterious Island' - which I read 25 times as a boy - I thought that was the best thing a person could do. The engineer in the book knows mechanics and physics, and he creates a whole way of life on the island out of nothing. I wanted to be like that.