The paper is lifted by a glass of water. Effective trick and its solution

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The paper is lifted by a glass of water. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

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Focus Description:

How to lift paper with a glass of water.

Focus secret:

For the trick, you need two glasses filled to the brim with water, and two pieces of paper the size of a postcard.

Call anyone who dares to easily pick up a piece of paper. When a volunteer is found, place one piece of paper on a dry surface and ask them to pick it up. Before he gets down to business, say: "Oh, one more thing! To make things easier, I'll lend you a couple of my glasses."

Everyone will think you mean glasses, and you will hand a volunteer a full glass in each hand and say: "You can't spill a drop of water, can you?"

Focus Paper is lifted by a glass of water

With some effort and spilling some water, the volunteer will do the job. Thank him for his efforts and show him how to pick up a piece of paper from another (dry) place without any difficulty. Touch the bottom of the glass to the water spilled on the table and touch the leaf. The paper will stick to the bottom of the glass.

Focus Paper is lifted by a glass of water

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The secret of the strength of ancient Roman concrete 09.07.2017

Marie D. Jackson from the University of Utah, USA, and her colleagues from various American, Italian and Chinese scientific institutions have found the answer to the question why modern concrete, used everywhere, from roads to buildings to bridges, can fail in just 50 years, but thousands of years after the Roman Empire collapsed, its concrete structures are still standing. It turned out that the matter was in a special ingredient, which over time makes the material stronger, not weaker.

The scientists began their search with an ancient solution recipe, described by the Roman engineer Marcus Vitruvius in 30 BC. His instruction is to make a mixture of volcanic ash, lime and sea water, add crushed volcanic rocks to it and place it in a wooden mold, which should then be immersed again in sea water.

There are many references in history to the durability of Roman concrete, including a cryptic note written in 79 BC describing concrete exposed to seawater as "a single mass of stone, impregnable by the waves and growing stronger every day." What does it mean?

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The researchers found that when seawater percolates through the cement matrix, it reacts with volcanic ash and crystals to form Al-tobermorite and a porous mineral called phillipsite.

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