By Glen Vecchione, Nina Zottoli

Can quantum operations, recombinant shapes, and hid distribution really result in enjoyable? certain they could! simply try out those optical illusions, mechanical flair puzzles, maps and mazes. "Selections are interesting."-- college Library magazine.

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4. When the cone is placed on the water with its base down, the wall of water closes in on the sloping sides of the cone. 5. The space around the point is too small to allow enough air to be "attached" to reduce the density of the cone so that it will float. Therefore, the cone sinks when placed base down on the water.

Over a period of 10 years, Mazzoleni made an average of about one compass a month. The instruments themselves brought no significant profit. Galileo's earnings came mostly from the course of instruction he offered to train purchasers in using the compass. Eventually he produced an instruction booklet in which he described more than 30 kinds of calculations. Galileo also produced a brief treatise on mechanical devices and taught it at the university. In the treatise, Professor at Padua Galileo explained that machines make it possible to raise a large weight with a force less than is needed to lift the weight directly.

Spectacle makers in Holland had recently made spyglasses that magnified distant objects three or four times. About a foot long, they had a convex lens at one end and a concave lens for the eyepiece at the other end. Peddlers were offering such telescopes for sale on the streets of Paris. Paolo Sarpi in Venice wrote Galileo that an enterprising foreigner had offered to sell the secret of the spyglass to the government there. Sarpi was confident that Galileo could find the secret and improve on it.

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Challenging Math Puzzles by Glen Vecchione, Nina Zottoli
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