The photo is a joke. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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The photo is a joke. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

You are looking at a photograph of a person, he is looking at you. If you turn the back of the photo: the person will look in a completely different direction. You can make it look back at you even if you don't reset the photo.

Focus secret:

To do this, you just need to look through the photo at any light source, for example, an electric light bulb.

Author: V.Postolaty

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Random news from the Archive

Cotton absorbs water from the air 25.01.2013

A new method of processing cotton fabrics has been developed. A special polymer coating gave the material the ability to water from the environment - and quite a lot, up to 340% of its own weight. Researchers from the Eindhoven University of Technology, together with scientists from the Hong Kong Polytechnic University, have developed a special technology for processing cotton fabrics. This technology allows cotton to absorb an exceptionally large amount of water - up to 340% of its own weight.

The new cotton fabric can be useful in a variety of areas: from the production of hygiene products and clothing to obtaining water in deserts and mountains. The secret of a new type of fabric is in the PNIPAAm polymer coating - poly(N-isopropylacrylamide). A fabric coated with such a coating has a number of interesting and useful properties, for example, at temperatures below 34 degrees Celsius, such cotton has a spongy structure at a microscopic level and effectively absorbs water.

Experiments show that coated cotton absorbs 340% of its own weight in water, while uncoated cotton absorbs only 18%. At the same time, when the temperature rises, the material becomes hydrophobic and gives off water. This property of the new material allows it to collect water from fog in desert and mountainous areas. Poly cotton nets can provide water to small communities or plants. Also, comfortable clothes and equipment can be made from the new fabric: sports shoes, clothes, tents, raincoats, etc.

One of the main advantages of the new technology is the low cost of producing coated fibers. The main material, cotton fabric, is inexpensive, and the polymer coating increases its price by only 12%.

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