Classic Brainteasers by Martin Gardner

By Martin Gardner

"From math, technology, and good judgment puzzlers to be aware video games to what's-wrong-with-this-picture demanding situations. caricature illustrations provide the ebook pick-me-up allure, yet it is the video games themselves that may retain readers going as they fit wits with Gardner, problem their buddies, or just learn alongside and search for the solutions within the back."--Booklist.

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The Hindu Squares How many different squares can you find in this picture? The answer looks easy, but it's harder than it seems. There may be more here than you think there are! Answer on page 88. 52 Exploring the Moon These astronauts are exploring a crater on the moon. Somewhere in the picture, the artist has made a scientific error. First see if you can find it. Then check your guess with the answer on page 88. 53 Pepper or Salt? This is Professor Piffle's latest invention—an automatic salt-and-pepper shaker.

Right now he's about to use it on one of his favorite dishes—hot soup. If he turns the crank in the direction of the arrow, will this amazing machine shake salt or pepper in his bowl of soup? Answer on page 88. 54 K n O t S OF N 0 t ? " vou pull on the ends of each rope shown above, two ropes will f ° r r n knots a n ( J t v v o won't. Can you pick out the two that will? Answer on page 88. is twinkling between the horns of a new moon. Somewhere in this picture, too, the artist has made a glaring scientific error.

What's wrong with this i storv? Answer on page 85. 35 Who Reads Faster? If it takes Willie 80 minutes to read a short story, and it takes his sister an hour and ten minutes to read the same story, who is the faster reader? Answer on page 85. Ripping Good Puzzle If you were to tear pages 8, 9, 48, 53 and 54 out of this book, how many separate sheets of paper would you rip out? Answer on page 85. Can you figure out a way to hold a piece of rope or string, one end in each hand, and tie a knot in the string without letting go of either end?

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