Box with a double bottom. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Box with a double bottom. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

The magician has several postcards in his hands. First, he shows them to the audience - let them make sure that they are ordinary - and then he offers to tear one of them. He takes a box from the table and asks the viewer to put the torn postcard inside. He closes the box and immediately opens it again. And then he takes out a whole postcard.

Focus Box with double bottom

Focus secret:

Of course, you guessed that the box is not simple.

Make a small polished wooden box like a cigarette case. Both of its parts are the same, connected by loops.

You will also need a thin steel plate, cut to the inside size of the box and painted in the same color. Before leaving, put a whole postcard under the plate. Turn the box over - the plate will close the torn postcard, and a whole one will appear in the box.

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Atmospheric nitrogen battery 25.04.2017

Xin-Bo Zhang of the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, and colleagues have proposed a way to capture atmospheric nitrogen that could be used in a battery. The scientists described their development in an article published in the journal Chem.

As the most abundant gas in the Earth's atmosphere, nitrogen has long been an attractive option as a source of renewable energy. But nitrogen gas, which consists of two nitrogen atoms held together by a strong triple covalent bond, does not break down under normal conditions. Accordingly, the problem is to convert the chemical bond energy into electricity.

The principle of operation is based on reversing the chemical reaction that powers existing lithium-nitrogen batteries. Instead of generating power by decomposing lithium nitride (2Li3N) into lithium and nitrogen, the researchers' prototype battery runs on atmospheric nitrogen, which reacts with lithium to form lithium nitride. Its power output is short but comparable to that of other lithium metal batteries.

"This promising battery research based on a nitrogen fixation system not only provides fundamental and technical advances in energy storage technology, but also creates an advanced N2/Li3N (nitrogen-gas/lithium nitride) cycle for a reversible nitrogen fixation process," Xin said. Bo Zhang: "But the work is still in its early stages. More intensive efforts should be directed towards the development of battery systems."

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