20 facts about gold

Gold is a kind of precious metal with a relatively high value content. Praise words such as 'real gold is not afraid of fire' and 'the book has its own gold house' all express the lofty position of gold in people's minds. But what is less known is that gold also has medicinal functions and can be used to treat rheumatoid arthritis. What's even more ridiculous is that gold is a kind of precious metal in Algeria, and its value content is relatively high. Praise such as'real gold is not afraid of burning' and'there is a gold house in the book' all express the lofty position of gold in people's hearts. But what is less known is that gold also has medicinal functions and can be used to treat rheumatoid arthritis. What's more ridiculous is that in the Aztec language, this precious metal actually means'God's stool'! Here are twenty things you might not know about gold: 1. Gold may be the first metal processed by prehistoric humans. The gold ornaments discovered by archaeologists in Bulgaria date back to 4000 BC, so the age of gold appeared to coincide with the Stone Age. 2. In the 7th century BC, Italian dentists used gold wire to install dentures. As early as the 16th century, gold fillers were recommended for filling cavities. 3. When the Spanish colonial invaders landed in Peru in 1532, the Inca Empire had gathered the largest amount of gold in history. After the Inca King Atahualpa was captured by the Spanish conquerors, in order to save his life, he offered to use gold as a ransom. In the end, the gold utensils filled a 22-foot x 18-foot large room. 4. However, the Spaniards did not keep their promise and King Atahualpa was eventually killed. 5. The Aztec wording of gold is teocuitlatl, which means'God's stool'. 6. Conrad Rand found a 17-pound gold nugget on his father's farm in North Carolina in 1799. This is the earliest record of the discovery of gold in the United States. What makes people laugh is that they actually used the gold nugget as a stone to block the door. Three years later, a local jeweler recognized that it was precious gold. 7. Reid's father sold the piece of gold to a jeweler for only $3.50 (less than one thousandth of its true value). In the end, Reid knew the true value of gold (it can sell for $100,000 today) and began to explore the first commercial gold mine in the history of the United States. 8. Contrary to the story told by James Bond in the film 'GoldfingerBut the 'Goldfinger' crew obviously didn't know: When they painted'Bond Girl' Shirley Eaton all over her body with gold powder, they left a small patch in her stomach unpainted. 9. Gold is extremely malleable and tough. After casting, a 1-ounce piece of gold can be turned into a semi-transparent gold nugget that is five millionths of an inch thick, or it can be stretched to 50 miles long and 5 microns in diameter, which is equivalent to ten times the diameter of a hair. One part. 10. This kind of precious metal is also difficult to destroy. It has been said that'gold has a price' since ancient times. Therefore, we can recycle it. Of all the gold discovered in the past, 85% is still in use today. 11. The lunar landing module of the American Apollo spacecraft is covered with a layer of gold foil. The purpose of this is to protect the astronauts from radiation. Today, astronaut helmets are also covered with a thin layer of gold film to protect the eyes from the stimulation of strong light. 12. For more than 70 years, the standard method for treating rheumatoid arthritis has been to inject liquid made of gold from time to time, which can have an anti-inflammatory effect. Doctors still don't know the reason for the anti-inflammatory effect of gold. 13. The conversion of basic metals into gold is the goal that alchemists are always tirelessly pursuing. In fact, to some extent, the former Soviet Union's nuclear reactors also used radiation to convert lead cores into gold. 14. Gold is an environmentally friendly metal. The windows of some apartment buildings are coated with a layer of gold to help reflect sunlight in summer and absorb heat in winter. 15. However, the way to extract gold is an act that destroys the environment. Gold mines will discharge large amounts of cyanide into the water ditch, releasing nitrogen oxides and sulfur oxides into the air. In 2000, cyanide spilled from a gold mine in Romania caused serious pollution to the river, leaving 2.5 million people in the area without water to drink. 16. Australian researchers have discovered a peculiar microbe that 'cannibalize' traces of gold in rocks and then accumulate them into large pieces of gold. Mining companies are seeking to use such microorganisms instead of cyanide to extract gold from ore, a mining method that is minimally destructive to the environment. 17. In terms of gold reserves, the United States ranks first in the world. But if the gold ornaments are included, then India will grab the first throne of gold used for decoration in the world, and 20% is used in the thread of Indian sari. 18. The most gold-bearing place on the earth's surface is in the ocean, which is estimated to be around 10 billion tons. Unfortunately, no one has found an effective way to extract gold from the ocean. 19. However, compared with the gold reserves in space, this is only insignificant. In 1999, the data sent back by the near spacecraft showed that the amount of gold on the asteroid of Eros alone exceeded the total amount of gold mined in the history of the earth. 20. Unfortunately, we do not yet know how to mine gold in space. Previous: Jewelry School-Gold Next: Introduction to Gold Knowledge