By Guillermo Summers

¿Sabía usted que a John Walker le ardía los angeles cabeza de tanto pensar y que por eso inventó una cerilla a los angeles que también le ardía l. a. cabeza? ¿Sabía usted que allá por 1852 un tal Simpson (no el de l. a. tele) empezó a utilizar el cloroformo para dormir al own sin necesidad de ver los angeles tele? ¿Sabía usted que Benjamín Franklin period científico, moralista, impresor, editor, urbanista y político, pero que paradójicamente se hizo famoso por inventar tontamente el pararrayos jugando con una cometa? ¿Sabía usted que de cada a hundred inventores, 50 son los angeles mitad?
¡Bueno, pues ya lo sabe!, y si quiere aumentar sus conocimientos sobre el tema, no lo dude, hágase con este libro.

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Extra resources for 50 inventos y la mente que los parió

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Often, a cen~ tral particle is surrounded on all sides by other parti~ 60 .. - - - des. Here's a puzzle that will help you visualize a crystal pattern. Suppose you coat a tennis ball with glue. What is the maximum number of tennis balls that can attach directly to this sticky surface? Answer on page 92 Testy Target ••• Ten arrows are shot at the target below. One of them misses the target completely. The others all strike it. If the total sum of points is one hundred, in which part of the target did each arrow strike?

C. These puzzles were part of an 18V2foot scroll called the Rhind Papyrus. Times have changed since then, but many puzzles haven't. Just try these next ones. 63 Examine the two stacks of number blocks. If you exchange one block from one column with one block from the other, the number of their sums will be equal. Which blocks need to be exchanged? 1 5 9 14 4 12 7 8 N ow that you know how to balance two columns, you're ready to move up to three columns! By exchanging one block from each column, each of the three blocks' sums will be equal.

T ~t:~ 1_-. :. o • • • • • • • .... o. , -fiNAL RO\1l\J\>- ~t C ;: c Answer on page 89. 56 Ancient Man ++. An ancient Greek was said to have lived one-fourth of his life as a boy, one-fifth as a youth, one-third as a man, and spent the last 13 years as an elderly gent. How old was he when he died? Answer on page 90. Lights Out! ++. The total output of electrical energy from your brain is only about 20 watts. That's not an avalanche of power (especially when you consider that most household light bulbs use five times that amount).

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