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J. Andrés Cerquera

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MATH PUZZLE: Can you replace the question mark with a number?

Giulio Natta

Born 26 Feb 1903; died 2 May 1979 at age 76.Italian chemist who contributed to the development of high polymers useful in the manufacture of films, plastics, fibres, and synthetic rubber. Along with Karl Ziegler of Germany, he was honoured in 1963 with the Nobel Prize for Chemistry for the development of Ziegler-Natta catalysts. Natta found that certain types of Ziegler catalysts lead to macromolecules with a spatially uniform structure, called isotactic chains. Whereas ordinary hydrocarbon chains are zigzaged, isotactic chains form helices with the side groups pointing outwards. Such polymers give rise to novel synthetic products. Examples are light but strong fabrics, and ropes which float on the water.

A little boy and his grandfath...

A little boy and his grandfather are raking leaves in the yard. Thelittle boy finds an earthworm trying to get back into its hole. He says,"Grandpa, I bet I can put that worm back in that hole." The grandfatherreplies, "I'll bet you five dollars you can't. It's too wiggly and limpto put back in that little hole."
The little boy runs into the house and comes back out with a can ofhairspray. He sprays the worm until it is straight and stiff as a board.Then he puts the worm back into the hole.
The grandfather hands the little boy five dollars, grabs the hairspray,and runs into the house. Thirty minutes later the grandfather comes backout and hands the little boy another five dollars. The little boy says,
"Grandpa, you already gave me five dollars."
The grandfather replies, "I know. That's from your grandma
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