The Invisible World. Everybody has one. It’s called a “haunt detector.” It’s the little alarm that goes off in our heads whenever we detect that something mysterious or supernatural has occurred.

http://www.amazon.com/Invisible-World

You could be sitting around relaxing one day at home, and for no special reason you start thinking about someone. Maybe you haven’t thought about this person in years. Then the phone rings; you pick it up, and amazingly, it’s that person! Many of us have experienced this phenomenon.