Which hand is the coin in? Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Which hand is the coin in? Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

The magician asks someone to take a dime in one fist and a penny in the other. Then he suggests multiplying the numerical value of the coin in the right fist by eight (or any other even number), and the numerical value of the other coin by five (or any odd the number you want). By adding these two numbers, the viewer must say whether the number is even or odd. After that, the artist says which coin the viewer has in which hand.

Focus secret:

If the sum is even, then in the right hand - a penny; if odd - a dime.

Author: M.Gardner

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Random news from the Archive

Power lines for green energy 02.02.2016

American scientists led by Alex MacDonald have developed a scheme for transmitting solar and wind energy through power lines domestically, which circumvents the problem of storing such energy and reduces carbon dioxide emissions by 80%.

Until now, the widespread use of green energy has been limited by the inconsistent nature of its production: the sun does not always shine, and the wind also blows. Therefore, the generated energy must be stored somewhere in order to be used later during periods of darkness or calm. Storing sufficiently large energy reserves requires complex and expensive equipment. An alternative option was to transfer energy from those areas where it is generated to those where this is not currently happening - however, until now it was believed that the design features and capabilities of existing electrical networks do not allow this.

And now McDonald and his colleagues have proven that with the help of new high-voltage direct current (HVDC, i.e. High-Voltage, Direct-Current) power lines, it is still possible to transfer green energy from one region of the country to another. Since the wind is always blowing in some part of the US, this will effectively provide (partly) the country with energy. In this case, it will no longer be necessary to store it.

The transfer of green energy from one area to another, according to NOAA experts, will be handled by a special computer program that will determine how to do it in the best way. Scientists have already created a working model of such a system and proved its effectiveness. In McDonald's model, the entire country was divided into 152 square meters, according to the number of district electricity networks.

Calculations have shown that with the introduction of this system, the United States will be able to reduce carbon dioxide emissions by 2030% by 80 compared to 1990, without spending resources on solving the problem of storing "green" energy.

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