Catch a finger. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Catch a finger. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

The magician, using a thin cord, makes double loops on the table, puts his finger in one of the loops and, pulling the ends of the cord with his free hand, demonstrates how the loop captured the finger. Then he does the same, but with his finger in another loop. The loop will not catch your finger. After that, once again laying out the loops on the table, invite someone to guess which loop you need to put your finger in so that the loop captures it. All attempts fail: the cord easily bypasses the finger.

Focus secret:

The secret of the trick is how you will turn the cord, laying the loops.

Focus Catch a finger

If, when laying the loops, the cord turns only in a horizontal plane, one of the loops will definitely capture the finger. If, while making loops, unscrew the cord in a vertical plane, both loops turn out to be false, and they will not capture the finger.

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Charging an electric car in 10 minutes 30.10.2019

In English, there is a term "range anxiety" - one of the factors that still prevents normal sales of battery-powered electric vehicles from being established. Roughly speaking, this is the fear that the battery will not be enough to get you to your destination. This fear is justified, because today the capacity of such batteries is small, and they charge from an hour, or even several times longer.

However, this problem may soon be a thing of the past. Scientists at the University of Pennsylvania have developed a technology that allows modern EV batteries to be fully charged in just a few minutes. "We have demonstrated that we can charge an electric car in 10 minutes and after that it will travel from 350 to 500 km," said chemical engineer Chao-Yang Wang. According to him, the technology supports 2500 such charging cycles, which is equivalent to 750 kilometers.

This is important because EV batteries (like those found in laptops and smartphones) are lithium-ion batteries that only last a limited number of charge-discharge cycles before becoming completely useless. One of the main factors contributing to the acceleration of this process is heating - that is why it is important to prevent the device from overheating and properly cool its electronic filling.

The new technology solves this problem quite elegantly. During extremely fast charging, the battery does heat up - but only for a very short time. Developer research shows that this greatly slows down battery wear compared to our usual counterparts.

"In this case, the positives and benefits for the user far outweigh the negatives," says Wang.

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