Where did emeralds come from? Detailed answer

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Where did emeralds come from? Detailed answer

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Where did emeralds come from?

In ancient times, different gemstones were distinguished only by their colors. The name "ruby" was given to all red-colored stones. All green stones were called emeralds. And all the blue ones were called sapphires. Later it was noticed that some gemstones are harder than others and last longer. It has been established that the value of a precious stone depends not only on its color, brilliance and rarity, but also on its hardness.

All semi-precious stones are called precious. But, strictly speaking, the word "precious" is used only in relation to the four most valuable stones - diamond, ruby, emerald and sapphire. The remaining valuable stones are called semi-precious.

Emerald is one of the softest gemstones. It is a type of beryl. In its ideal form, the emerald is rich, pure green. But flawless stones are rare and therefore very expensive.

In ancient times, all emeralds were mined in the mines of Egypt. These mines are still in operation today. But the number of mined emeralds is small. The best emeralds in our time are mined in mines near the capital of Colombia - Bogotá. There are deposits of emeralds in the Urals in Russia and in the Salzburg Alps. Several fine emeralds have been found in North Carolina. And more recent finds of emeralds have been made in the Transvaal (South Africa).

There are many legends about emeralds. One of them says that the Holy Grail, from which Christ drank at the last Vespers, was carved from a huge emerald. It was believed that the emerald has healing power - it cures epilepsy. According to another old legend, the emerald endowed its owner with the gift of predicting the future. It was said that by peering into the green depths, you can see things that will happen to you. The largest known uncut emerald is 5 cm long and 5 cm in diameter.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

When was surgery first used?

With modern hospitals and surgeons capable of performing any operation on the body, we believe that surgery is a modern phenomenon. In fact, surgery has been practiced since ancient times. Ancient people around the world used flint tools as surgical tools.

One of the most dangerous and difficult operations performed on the skull has been performed with flint tools since ancient times. And it was in prehistoric times. Flint tools were also used for opening abscesses and bloodletting. Other "tools" for this purpose were the teeth of fish and even the sharp thorns of plants. The cataract was removed from the eye with spikes.

The need for tools began to grow, and amputation saws appeared instead of flint tools. This is absolutely accurate, because many of the mummies found show the results of such operations.

When people learned to make tools from bronze and iron, scissors, iron needles and other complex tools were invented. With these improved tools, people performed more difficult operations. There are records that prove that most of the operations carried out today, including complex ones, were carried out in ancient times. Among the relics of Pompeii are very complex surgical instruments.

Operations were performed for thousands of years without anesthesia, which brought a person to an unconscious state. There was also a lack of knowledge on how to avoid infection. Operations began to be carried out when nothing was known about the causes of diseases. But they must have been generally successful, otherwise they would not have continued. Two discoveries made modern surgery possible: the advent of anesthesia and means of preventing infection.

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Ideal temperature in pensioners' bedrooms 30.03.2024

Quality sleep plays an important role in maintaining health and well-being, especially for older adults. In recent years, research has been conducted to determine optimal sleep conditions for this age group. One of the key aspects of this research is to determine the ideal indoor temperature for older adults during sleep.

A team of scientists from the Marcus Institute for Research on Aging and Harvard Medical School conducted a sleep study of older adults to find out the optimal temperature in the bedroom for quality rest.

Previously, it was believed that the ideal temperature for sleep was between 16 °C and 18 °C. However, new research has shown that it is recommended that people over 65 sleep in a warmer room than previously thought.

Over 11 nights, experts monitored the sleep of 50 older people and concluded that the optimal temperature for a good night's rest ranged from 20°C to 25°C. These data allow us to more accurately determine the sleep conditions that promote the best rest for older adults.

It's important to note that too high a temperature in the bedroom can also negatively impact your quality of sleep. According to scientists, a clinically significant decrease in sleep efficiency of 10% occurs when the bedroom temperature rises to 25°C-30°C.

Studying the temperature patterns in the bedrooms of older people helps to better understand what conditions promote the best rest and sleep in this age group. Optimal sleep temperatures ranging from 20°C to 25°C may be key to improving the quality of life and health of older adults.

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