By Martin Gardner
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But in doing so, it will lose heat, and the cold ice cube will cause the salt water to freeze again. After a minute or two, lift the string. The cube will adhere tightly to it! There is a lesson here for anyone who sprinkles salt on an icy sidewalk. Unless you use enough salt to melt all the ice, the water will freeze again. COPYING FLUID With the aid of this fluid, newspaper photographs and cartoons can be transferred easily from the newsprint to blank sheets of paper. To make the fluid, mix four parts of water with one part of turpentine.
UNREVERSED IMAGE When you look into a mirror, you don’t see yourself the way others see you. You see a reversed image. If you part your hair on the left, your image parts its hair on its right, and so on. With the aid of two pocket mirrors (preferably without frames), you can actually see your face the way others see it. Hold the mirrors at right angles to each other and look directly into them as shown. You’ll be able to adjust the mirrors until they form a perfect reflection of your face. Now, wink your right eye.
In other words, the zigzag path will never become a straight line. PYTHAGOREAN PLEASANTRY Hundreds of ingenious proofs have been devised for the famous Pythagorean theorem, or forty-seventh proposition of Euclid, which states that the square on the hypotenuse of a right-angled triangle equals the sum of the squares on the other two sides. Here is a highly unorthodox but convincing way to demonstrate the theorem with the aid of a pair of scissors. First draw the squares on the two shorter sides of any right-angled triangle.