Hello there Claes Uggla...

...Where do you work and what do you work with?
Karlstad university,Teaching and research.

What have you studied?
Physics and mathematics.

Why is it that math is so fun?
Math is the key to understanding the universe.

In what way do you work with math within your profession?
I am mathematical physicist. 

What in your career has been challenging?
Solving the riddle of the universe!

What topic are you going to talk about on the Sonja Kovalevsky days?
Astronomy and cosmology.