I loved doing problems in school.

The only way I could relax was when I was with my children.

The greatest problem for mathematicians now is probably the Riemann Hypothesis.

I was so obsessed by this problem that I was thinking about it all the time - when I woke up in the morning, when I went to sleep at night - and that went on for eight years.

I never use a computer.

I had this rare privilege of being able to pursue in my adult life, what had been my childhood dream.

Just because we can't find a solution it doesn't mean that there isn't one.