Is it your lying, cheating ex-husband?
Your sadistic high school gym teacher?
Your boss who loves to humiliate people in meetings?
The colleague who stole your idea and passed it off as her own?
Is there a God?
How did it all begin?
Is there other intelligent life in the universe?
Can we predict the future?
What is inside a black hole?
Is time travel possible?
Will we survive on Earth?
Should we colonise space?