How to split a newspaper? Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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How to split a newspaper? Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Invite the audience to divide the newspaper in half. You need to act with only one hand - without the help of scissors! It is unlikely that anyone will decide on this if you add that the time is also limited to, say, three seconds.

Focus secret:

And the solution is simple. Having unfolded the newspaper, offer, at your command, to put your index finger in its very center. (To be sure, you can mark it with a dot.)

Focus How to divide the newspaper?

You just need to hit harder. And indeed, if you stretch the unfolded newspaper (but carefully so as not to tear it), and the viewer exactly follows your instructions, then in an instant the sheet will shatter into two identical parts.

Author: V.Postolaty

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Kevlar for battery 05.02.2015

Researchers at the University of Michigan are developing technology that will significantly reduce the risk of fire in lithium batteries. The essence of the development is the use of a high-strength barrier between the electrodes.

Kevlar nanofibers, a high-strength para-aramid (polyparaphenylene-terephthalamide) fiber used to reinforce composite materials, served as the material for the manufacture of the membrane. Kevlar is known to the general public for wear-resistant fabrics and protective sports equipment. It is also used in bulletproof vests.

In the case of batteries, the purpose of the Kevlar nanofiber membrane is to resist the formation of "sprouts" of metal that can cause a short circuit.

Previously, it was possible to obtain membranes with a hole diameter of the order of hundreds of nanometers. The diameter of the holes in the new membrane is 15-20 nm. Due to this, lithium ions pass through it unhindered, but lithium atoms do not. More precisely, individual atoms can do this, but the penetration of larger structures that can cause a closure is blocked.

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