Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


EFFECTIVE FOCUSES AND THEIR CLUES
Free library / Directory / Spectacular tricks and their clues

A row of thirteen dominoes. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Comments on the article Comments on the article

Focus Description:

For the trick, 13 bones are needed, which are stacked in a row face down. In the absence of a magician, one of the spectators moves one by one any number of bones (from one to twelve) from one end of the row to the other.

After that, the artist returns to the room, opens one bone; and the number of points on it turns out to be equal to the number of moved bones.

Focus can be shown any number of times.

Focus secret:

Bones, of course, are selected in a special way. The sums of points on them must consistently equal all integers from 1 to 12. The thirteenth will be a double empty. They are set in ascending order, starting with one at the left end. On the right, the row closes with a double empty.

Before leaving the room, the magician demonstrates how to move the bones; moving a few pieces from left to right, he must figure out how many points are now on the leftmost bone. Returning, he mentally counts up to this number, starting from the right. If there were, for example, 6 points on the left bone, he needs to count from the right to the sixth bone. The bone on which this number falls, he opens. If it happens to be a double blank, it is assigned the value 13.

It is very easy to repeat this trick. The artist must count to himself how many bones are left from open to the far left, figure out how many points are on the last one, and remember this number before leaving the room.

A curious situation arises if someone decides to play a trick on the demonstrator and does not rearrange a single bone; in this case, a double dummy will open.

Author: M.Gardner

 We recommend interesting articles Section Spectacular tricks and their clues:

▪ naughty cork

▪ Miracle Powder

▪ Turning water into ink and vice versa

See other articles Section Spectacular tricks and their clues.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Computers see as well as primates 31.12.2014

For decades, neuroscientists have been trying to develop computer networks that could mimic the visual skills that the human brain does very quickly and accurately, such as recognizing objects.

So far, no computer model has been able to match the primate brain in terms of visual recognition of objects in a short glance. However, a new study from MIT scientists shows that the latest generation of so-called "deep" neural networks are well matched to the capabilities of the primate brain.

Scientists began building neural networks in the 1970s in hopes of mimicking the brain's ability to process visual information, recognize speech, and understand language. Neural networks are based on the hierarchical principle of representation of visual information in the brain: from the retina to the primary visual cortex, and then to the inferior temporal cortex, at each level, detailing up to complete identification. To mimic this process, scientists create multiple layers of computation in their neural network models. Each level performs a certain mathematical operation, and at each level, representations of a visual object become more and more complex, and unnecessary information, such as the location of the object or its movement, is discarded.

In the current study, scientists measured the brain's ability to recognize objects for the first time by implanting electrodes in the primate cerebral cortex, and then compared the results with the results of deep neural network calculations. The results showed that neural networks have reached the level of visual information processing corresponding to the primate brain.

Now scientists are going to improve neural networks, giving them the ability to track the movement of objects and recognize three-dimensional shapes.

Other interesting news:

▪ Learning new things, we forget the old

▪ XNUMXD scanning system

▪ Tram without rails

▪ High performance PIC32 family with large memory

▪ Samsung Galaxy A7 smartphone

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ section of the site Tools and mechanisms for agriculture. Article selection

▪ article Armed and very dangerous. Popular expression

▪ How high can crocodiles climb trees? Detailed answer

▪ article Packet Node. Tourist tips

▪ article Computer interfaces. Directory

▪ article Dual mode charger. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

Name:


Email (optional):


A comment:





All languages ​​of this page

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua

www.diagram.com.ua
2000-2024