Invulnerable napkin. Effective trick and its solution

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

Invulnerable napkin. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

The magician holds a simple napkin, then takes the middle, twists the napkin, tears off the middle. Then he opens the napkin and shows that there is no hole in it.

Focus secret:

You need to prepare in advance. You take another napkin, tear off a piece from it and twist it, put it in the middle of the napkin. The viewer should not see her during the trick.

We recommend interesting articles Section Spectacular tricks and their clues:

▪ Paper rises with a glass of water

▪ A handkerchief from which a coin disappears (two ways)

▪ The viewer knows the secret of the trick, but cannot repeat it.

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

Infineon IRS200S Half-Bridge 2007V MOSFET Driver 25.03.2019

Infineon has introduced a new 200V IRS2007S gate driver for use with half-bridge MOSFETs in low (24V, 36V, and 48V) and medium (60V, 80V, and 100V) motor control applications. voltages.

The drivers feature proprietary surge protection technology, and their inputs are CMOS or TTL compatible. Driver outputs are buffered to minimize driver cross-conduction. The "floating" channel of the driver can be used to drive an N-channel MOSFET or an IGBT.

The IRS2007S drivers are available in standard 8-pin SOIC packages.

Key Features:

output current (rise/fall): 290mA/600mA;
gate voltage: 10...20 V per channel;
undervoltage protection for VCC and VBS;
3, 5, 15V compatible inputs;
synchronous signal delay in both channels;
insensitivity to negative bias voltage;
through conduction protection;
fixed dead-time: 520 ns;
ESD protection: 2 kV according to HBM.

Areas of use:

servo drives;
quadrocopters;
light electric vehicles (electric bicycles, electric scooters);
wireless charger;
other battery powered applications.

Other interesting news:

▪ Unmanned vehicles built the bridge themselves

▪ A new way to feel touch

▪ Newman K2S Tablet Phone with MediaTek MT6592 Octa-Core Processor

▪ ASUS Eee Tablet

▪ Smart Light Bulb Connected Cree LED Bulb

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Parameters, analogues, marking of radio components. Article selection

▪ article by Truman Capote. Famous aphorisms

▪ article Why are there patterns on the windows in winter? Detailed answer

▪ Mamura's article. Legends, cultivation, methods of application

▪ article Trunk amplifier for STB-receiver. Encyclopedia of radio electronics and electrical engineering

▪ article Switching voltage regulator for a phone with caller ID. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

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