Guess how much. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Guess how much. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Tell the audience: “Think of each a three-digit number, but be sure to such that the hundreds digit differs from the units digit and is not one less or more than it.

Write the reversed number for the intended number, that is, the number depicted by the same numbers, but taken in reverse order.

From these two numbers (conceived and reversed), take the larger and subtract the smaller from it.

For the resulting difference, write the reversed number again and calculate the sum of this difference and the number reversed for it, "

When all this is done, invite one of your comrades to add 100 to the number he got, another - 200, the third - 300, etc.

You can tell each of the participants in the game exactly what number he got!

Focus secret:

To do this, each time you will need to add to the number 1089 the number that you asked to add at the end. So, the first should get 1189, the second 1289, etc.

It would be even better if you write these numbers in advance on pieces of paper, put these pieces of paper in envelopes and write on them the names of your comrades participating in this game.

You will solemnly present these envelopes to their addressees.

Try to understand what is the matter, and then explain to your comrades.

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Random news from the Archive

Flexible thin batteries based on nickel fluoride 07.05.2014

James Tour (James Tour) and his fellow scientists at Rice University Laboratory have developed a flexible and ultra-thin battery, consisting of nanoporous nickel-fluoride electrodes, which "envelop" the electrolyte in layers. The model of the electrochemical capacitor presented by them has a thickness of only 0,025 cm, but in the future it can be easily scaled depending on the purpose of use. This will require either adding new layers or increasing their current sizes.

During testing by students at Rice University, the operation of a flexible plate battery was tested in practice. The device, small in size, successfully coped with a cycle of 10 charges and discharges, eventually losing 24% of its declared capacity before testing. The battery has also been tested for 1000 flex cycles. Of course, there have been attempts to develop such thin rechargeable batteries before, but their capacity at the time of their appearance left much to be desired, demonstrating significantly worse results compared to classic lithium-ion batteries.

“The materials previously used to create high-capacity batteries were very brittle in nature, so it was really difficult for us, as specialists, to find the right combination of elements to create a flexible battery with characteristics that meet all modern standards. The Laboratory had flexible systems at its disposal. However, we chose nickel fluoride as a more promising material with great potential. The system itself is both a battery familiar to users of mobile devices and at the same time a supercapacitor.

All this makes it possible to charge and discharge a flexible thin-film battery based on nickel fluoride at a sufficiently high speed and at a high current, spending the shortest possible time on this. But if you need to use the battery as a standard battery for mobile electronics, then the system is able to charge and discharge much more slowly,” one of the project participants said in an interview.

To create the supercapacitor, the scientists deposited a 900-nm layer of nickel fluoride on a special substrate with special 5-nm pore-holes. After that, the substrate was removed, and the electrolyte used in the structure in the form of a solution of potassium hydroxide in polyvinyl alcohol was "squeezed" into a single structure by electrode plates on both sides. As a result, specialists from the Laboratory managed to avoid the appearance of potential signs of deformation of the created flexible structure, and students in practice confirmed the assumption of the reliability of the development after the completed testing stage.

Everything described above is an extremely reliable, capacious system, which in turn is as simple as possible to create very powerful battery systems. Some companies have already expressed interest in further commercializing the project, which could prioritize the use of such nanobatteries in portable electronics and increasingly popular wearable gadgets such as smartwatches and medical bracelets.

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