Answer:
How do you discover something that does not exist?
Two fathers and two sons are in a car, yet there are only three people in the car. How is this possible?
A bike rider is traveling north at 25 mph, a car passes the bike rider going north at 40 mph. At the same time the bike rider passes a jogger running north at 5 mph. Which will move away from the bike rider at a faster pace, the car or the jogger?
What moves and touches water but doesn't get wet?
If you are running in a race and pass the second place person, what place are you in?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.