Open an empty jar. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Open an empty jar. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

The magician shows an empty soda can, covers it with his hand, shakes the can, then removes his hand. A tongue appeared. Now the magician opens the jar and pours the contents into the glass.

Focus secret:

Before the focus begins, it is necessary to cut out a figure similar to a hole from black cardboard. We take a figure from cardboard and fix it over the hole so that the cardboard does not fall. Now it looks like the jar is empty. We cover the jar with our hand, quietly take the cardboard while shaking. We remove our hand, quietly put the cardboard in our pocket and open the jar.

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Random news from the Archive

Nanolaser Chameleon 04.07.2018

Inspired by nature, researchers at Northwestern University (USA) have developed a new nanolaser that changes colors using the same mechanism as a chameleon.

The chameleon can easily change the color of the body and thereby merge with the environment. What makes this color game happen? Due to the redistribution of pigments of four colors, which are located in special "branched" cells (that is, these cells have processes) - chromatophores. These pigments are known to absorb visible light in a narrow spectral range. However, this is not the only mechanism that the chameleon uses. A few years ago, Swiss scientists discovered that other pigment cells, iridophores, also play an important role in color change, which, on the contrary, do not absorb, but reflect light. These cells contain crystalline purines, mainly guanine nanocrystals, which are organized into a well-structured lattice. Changing the distance between nanocrystals (lattice pitch) leads to a change in skin color. Scientists from the USA took the second mechanism as a basis for their new laser.

In the same way that a chameleon controls the distance between nanocrystals on its skin, the laser changes the size of the periodic lattice of metal nanoparticles located on a flexible polymer matrix. When the matrix is stretched, the nanoparticles move farther apart, and when, on the contrary, it is compressed, the nanoparticles approach each other. Due to such actions, the wavelength of the light emitted by the laser changes, and, accordingly, its color changes.

The development of American scientists can be used to create advanced flexible optical displays in smartphones and TVs, portable photonic devices and ultra-sensitive sensors that measure voltage.

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