Extra square. Effective trick and its solution

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EFFECTIVE FOCUSES AND THEIR CLUES
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Extra square. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

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Focus Description:

Instead of 64 squares, it turns out 65.

Focus secret:

For the demonstration you will need: a square sheet of cardboard (20 x 20 cm), a ruler, a felt-tip pen, scissors.

First, draw 64 identical 8x8 cm squares on cardboard. Carefully cut the cardboard into 4 pieces, as shown in the figure. Now swap these parts and glue them again, not into a square, but into a 13x5 cm rectangle. Ask the audience to multiply 13 by 5, or have someone count the squares - it's 65!

Focus Extra square

Imagine extreme confusion: "Something does not converge. First there was a square, each side of which was equal to 8 squares. 8 times 8 - it will be 64. Then the square was cut, and its parts were folded differently. It turned out to be a rectangle with an area of 65 squares. From where did you get an extra square?"

When demonstrating this trick, it would be nice to tell a story, for example, about a cook who was able to feed 65 children with 64 pieces of pie, etc.

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Random news from the Archive

Voting in the animal world 18.08.2003

Since the thirties of the last century, when dominant and subordinate individuals were discovered among animals, the idea of \uXNUMXb\uXNUMXbstrict hierarchy and even dictatorship in animal communities has been established.

However, new data suggests that there is democracy in the animal world. This system is better than submission to the sole decision of the leader, if only because the members of the community are more willing to implement the joint decision of the majority.

Animal behaviorists from the University of Sussex (UK) found that their wards even use voting. Opinion on controversial issues is expressed in different ways. Gorillas grunt, chimpanzees squeal. When a flock of swans is about to take to the air, the birds begin to stretch their necks and nod their heads. As soon as the frequency of such movements in most birds reaches 26 per minute, the flock rises to the wing.

A herd of red deer lying on the grass moves to another place when 62 percent of the adults get to their feet. Suffrage is not granted to everyone; in most species, only adults vote. In baboons, everything is decided by a small group of males - the "political elite".

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Animals instinctively see which side the majority is on. As a rule, a simple majority is enough to approve the results of the vote, but for gorillas, a two-thirds majority decides.

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