Puzzle 1
Take a normal piece of paper, exactly 0.1 mm thick.
Fold it in half, and then in half again, and again, and again.
Do this a total of 50 times.
How thick would the final paper be (if this could be done)?
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Puzzle 2
What is the minimum number of queens required on a chessboard such that all squares are attacked?
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Puzzle 3
Place all of the digits from 1 to 9 into the circles so that the sum of the numbers in each straight line is the same.
Puzzle Copyright © Cihan Altay
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Puzzle 4
What word most logically goes in the brackets:
EASY [HEAD] HARD
OOZE [----] FACT
Puzzle Copyright © Kevin Stone
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