IBSAF WORLD - November 2007

1	When I'm used, I'm useless, once offered, soon rejected. In desperation oft expressed, the intended not protected. What am I?
2	There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?
3	A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees; thinking no matter what the carnie writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?
4	What is black when you buy it, red when you use it, and gray when you throw it away?
5	What is it that when you take away the whole, you still have some left over?
6	Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?
7	What can be heard and caught but never seen?
8	They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own. What are they?
9	This is as light as a feather, yet no man can hold it for long. What is it?
10	Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
	Answers to the puzzles