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

Focus with marked dates. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Comments on the article Comments on the article

Focus Description:

The viewer is offered to open the monthly report card for any month and circle one date in each of the five columns of his choice. In the case when the numbers are arranged in six columns, which is very rare, the sixth column is not taken into account. In this case, the magician stands with his back to those present.

Still not turning around, he asks, "How many Mondays do you circle?", then "How many Tuesdays?" and so on, going through all the days of the week. After the seventh and final question, the demonstrator announces the sum of the circled numbers.

Focus secret:

The sum of the numbers in a string that starts on the first of the month is always 75 (except in non-leap year February). Each marked number in the next line increases this sum by 1, in the next line by 2, and so on; each marked number in the previous line reduces the mentioned amount by 1, in the previous line by 2, etc.

Let, for example, the first day of the month fall on a Thursday, and circle one Monday, one Thursday, and three Saturdays; the demonstrator performs a mental calculation: 75+3-2-1-3=78 and announces the result.

Of course, the viewer must know in advance what day the first day of the month chosen by the viewer falls on.

Author: M.Gardner

 We recommend interesting articles Section Spectacular tricks and their clues:

▪ Twelve domino bones

▪ Mystery of the Nine

▪ live ball

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:

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 ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

Rust water treatment 29.08.2023

The achievement of scientists from the University of Erlangen, who developed a revolutionary antimicrobial method of water purification, represents a significant breakthrough in ensuring public access to clean drinking water.

The researchers presented an innovative solution aimed at improving the quality of drinking water by combating microbes and pathogens.

The essence of the method is to create an antimicrobial coating that can neutralize microorganisms contained in water. Using advanced nanomaterials and technologies, researchers have developed a coating that actively targets bacteria and viruses, preventing them from multiplying and surviving.

The fundamental component of this method is called "Smart Rust", since its base is iron oxide. Treated with phosphoric acid, it attracts dirt molecules, which can then be removed with a magnet.

The potential of this method is of great help in the purification of drinking water, especially in conditions where sanitary standards are not always met or when water is at risk of contamination by pathogens. The introduction of an antimicrobial coating can significantly reduce the risk of spreading infections through water, which contributes to a safer water supply.

This innovative technique can be used not only in cities and towns, but also in remote areas where access to clean water remains a challenge. Thanks to the use of advanced technologies, this method becomes an important tool in the daily struggle for quality drinking water.

Scientists working on this method expressed the hope that its implementation will help improve hygiene conditions in various regions and make drinking water safer for consumption. This discovery highlights the importance of environmental innovation and providing humanity with access to clean and safe water.

Other interesting news:

▪ Loneliness is dangerous

▪ Boots with spring studs

▪ 20 new moons of Saturn discovered

▪ Honeywell NSC Series Differential Sensors

▪ Highly sensitive camera will search for extraterrestrial life and dark matter

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ section of the site Big encyclopedia for children and adults. Selection of articles

▪ article Barcode. History of invention and production

▪ What were the results of the struggle for independence of the British colonies? Detailed answer

▪ article Work in a career. Standard instruction on labor protection

▪ article Triac power regulator. Encyclopedia of radio electronics and electrical engineering

▪ article Not putting away newspapers. Focus Secret

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