Some wonder whether some day we will arrive at a theory of everything and run out of new problems to solve - much as the effort to explore the earth ran out of new continents to explore.

In order to achieve a true understanding of string theory, some new idea will be required, and most likely, some break with the concepts on which we've traditionally based physical theory.

I had set out to disprove quantum field theory - and the opposite occurred! I was shocked.

Turning around the severe structural problems of the Japanese economy will take a few years of sustained effort.

We may have charted all the continents on the planet, and we may have discovered all the mammals, but that doesn't mean that there's nothing left to explore on Earth.

I believe mobile technology has a much broader role to play. It could solve some of the biggest problems on earth.