What is your main fear?

The absence of critical thinking skills among the masses.

Anything harmful or hurtful happening to my children.

Well, I don't have any fears that I have to worry about but I am afraid of heights (falling off a ski jump, say), and being in an enclosed space in the dark. So, that would be like lying precariously in a coffin on top of a mountain, totally unlikely to happen.

Heights is one of mine as well, that and roller coasters and driving in heavy traffic.

My brother said it's dying in space. But that's probably a joke.