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Alchemy was the ancestor of the philosophy of chemistry, and it was the embryonic form of chemistry. Its goal was to transform some basic metals into gold and silver through some kind of conversion agent (commonly known as the Philosopher's Stone or Philosopher's Stone), or to create panaceas and immortality elixirs. Alchemy originated in Greece, Egypt, and other regions in the first few centuries of AD. Later, it spread to Arabia and developed in the Muslim world. Then, the concept spread to Europe and reached its peak during the Renaissance. At that time, many famous scholars such as Newton and Boyle were its supporters. In modern times, with the development of science, alchemy and chemistry began to separate, and many scholars criticized it. In recent years, due to the emergence of fictional works such as novels and movies, and the rise of mysticism, people had become more interested in alchemy. However, this alchemy was different from the alchemy in history. The early alchemy ideas were influenced by Greek scholars such as aristotle and Thales. During the Middle Ages and the Renaissance, it was gradually associated with theological ideas and astrology. Alchemy was mainly distributed in Europe, Egypt, and Arabia around the Mediterranean basin. China's alchemy was also alchemy to a certain extent. In terms of practical operation, the ancients used the characteristics of mercury to refine gold. Mercury could be mixed with solid metal powder at room temperature to produce an "amalgamation" reaction to form an alloy. For example, mercury combined with gold to form a "gold amalgam." In ancient Egypt, there were records of using "gold amalgam" to gild iron in the 3rd century AD. In ancient Chinese alchemy, there was also a method of adding mercury to dissolve gold. First, the gold-bearing ore was crushed, ground, and separated from the gold sand. Then, mercury was added to react, and after burning to remove impurities, replacement, heating, and other steps, pure gold was finally produced. Modern research on gold amalgam was more comprehensive. It was also used as a dental filling material, but low-quality cosmetics and medicines contained mercury. If they came into contact with gold jewelry, they might form gold amalgam, causing white spots and brittleness on the surface of the jewelry. It could be solved by burning the mercury at high temperatures. In addition, there were some fictional stories based on the concept of alchemy, such as the creation of "little people in bottles," but these were urban legends. Hurry up and click on the link below to return to the super classic "Lord of Mysteries"!

The following are some beautiful sentences that contain "stealing half a day's leisure": "Stealing half a day of leisure, a cup of tea is intoxicating." " A cup of fragrant tea and a book, I stole half a day of leisure; a touch of the setting sun and a pot of wine, I wish to be free for half a lifetime." "Stealing half a day of leisure, my mood is half Buddha and half immortal." While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!

The following are some cultural relics related to concubines: - The Palace Museum collected many "imperial concubines" jewelry, such as gold inlaid red sapphire ring (Qing Dynasty), peach red tourmaline melon style pendant (Qing Dynasty), point jade inlaid jewelry five phoenix mother-of-pearl (Qing Dynasty), green flat square (Qing Dynasty), gold inlaid pearl jade earrings (Qing Dynasty), Empress Xiaoduan phoenix crown (Ming Wanli), gold inlaid pearl jade Zhi orchid katydid hairpin (Qing Dynasty) and so on. - In 1951, the "Golden Liquid of Feces" was unearthed from the tomb of the seven concubines of the Wanli Emperor. According to ancient records, this was a rare item in the palace and was regarded as a treasure by the concubines. - In the tomb of Liu Fei's concubines, there was a "silver belt hook with an unforgettable memory". This was a token of love that Liu Fei gave to his concubine. After the concubine died, she would bring it to the tomb. In addition, the tomb may have unearthed a "bronze ancestor" cultural relic, which some archaeologists believe may be a female (Liu Fei's concubine)"toy." - The cultural relics reflected the level of the imperial harem. For example, in the imperial harem of the Forbidden City, different levels of concubines used different tableware. The empress could use a bowl with yellow glaze inside and outside, the imperial consorts and imperial consorts used a bowl with yellow outside and white inside, the imperial consorts used a bowl with yellow green glaze, and the imperial consorts used a bowl with blue glaze. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

**Title: The Feeling of Wearing a Diving Suit** When I first put on a diving suit, it was a truly unique experience. Physically, the diving suit felt like a second skin hugging my body tightly. If it was a well - fitted suit, it provided a sense of security. As I zipped it up, I could feel the snugness around my body, which was essential for the upcoming underwater adventure. The material of the diving suit had its own texture. Some diving suits are made of neoprene, which is smooth on the outside but gives a firm grip when in contact with the body. When I moved my limbs, I could sense a certain amount of resistance at first. However, as I got used to it, I realized that this resistance was also what helped me maintain my body shape and movement direction underwater. Mentally, putting on the diving suit was like donning a special armor for exploring an unknown world. There was a sense of excitement and anticipation. I knew that once I was in the water, the suit would protect me from the coldness of the water. Even before getting wet, I could already imagine the insulating effect it would have, as if it was building a warm barrier between me and the potentially cold underwater environment. Moreover, the diving suit made me feel more like a professional diver. It was a symbol of my readiness to discover the beauty beneath the water surface, whether it was the colorful coral reefs or the mysterious marine creatures. It gave me the confidence to face the challenges of the underwater world, such as the pressure and the limited visibility. In conclusion, wearing a diving suit is not just about covering the body; it is an experience that combines physical sensations and mental states, preparing me for an amazing journey underwater. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Is it allowed to wear a wristband during the exam? <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Can the observers in the hearing make a statement? <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There was an incident where a parent and a teacher fought in school. Parents went to the school to coordinate education issues and found their children standing by the podium. After questioning, they suspected that their children had been punished to stand. During the process of communicating with the Taoist teacher, there was a conflict. The Taoist teacher first grabbed the male parent's neck and raised his fist to hit him. The female parent kicked the teacher twice, and then the teacher grabbed the female parent's neck. The male parent hit the teacher a few times and dragged him to the ground. After the incident, both parties were identified as minor injuries and were judged by the police station to be fighting each other. There were many doubts about this matter. The parents insisted that the teacher's first move could not stand up to scrutiny. Some netizens thought that this was an incident caused by parents overprotecting their children and frequently complaining. Parents had a certain responsibility in this incident. Of course, it was also wrong for teachers to fight with parents in front of students. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The single-temperature mini refrigerator was a type of cold storage device. Its working principle was the same as that of a refrigerator. The cold storage temperature was below 0 ° C. In terms of function, it was relatively simple. It only had one temperature zone, and the temperature in the entire freezer was the same. It was usually set to freeze, suitable for storing food that was not immediately eaten for a long time. In terms of convenience, it mostly adopted the design of opening the lid. When opening the door, it needed to lift it up forcefully. When taking items, it needed to bend down. It was more laborious to take things at the bottom. In terms of cost, the price of a single-temperature mini refrigerator with the same capacity was often relatively low. A 200L refrigerator could be bought for less than 1,000 yuan, but the power consumption was relatively high. For example, when a 200L refrigerator was empty, it would consume about one or two degrees of electricity a day. After it was filled with things, the power consumption would soar to nearly ten degrees of electricity a day. In terms of preservation ability, due to its non-partition design, whether it was raw food, cooked food, meat, or vegetarian food, they were all placed in the same grid, which was more conducive to the growth of bacteria. The ingredients were also easy to contaminate each other, so the preservation ability was poor. In terms of appearance design, most of them were horizontal in shape and took up a lot of space. Its capacity is usually around 100 - 300 liters, suitable for users who need more frozen food. It is commonly used in commercial places such as supermarkets and restaurants to store large quantities of frozen food, such as ice cream and meat. In terms of the cooling method, the main method was direct cooling. The freezing effect was good but it was easy to frost. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The American singer Lauv imitated the China actress Xu Dongdong and posted a video on social media, causing a heated discussion among netizens. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were many examples of young singers singing in bars. There were many bar singers who earned income from live singing. For example, Liu Yuanyuan, a post-95 singer, started as one of the top ten singers in the school. After becoming a mature singer, she earned more than 10,000 yuan a month, and her daily income could reach 700 yuan. There were also many well-known singers who had the experience of singing in bars. For example, Zhang Huimei was first discovered by Zhang Yusheng when she was singing in a bar in Taiwan. Later, she was discovered, signed, and released an album to start her own era. A Xin of the Xin Band sang in bars for 10 years. Every day, he sang at a high intensity and trained his loud voice to produce later classic works. Chen Chusheng began to sing in a bar in Shen Zhen at the age of 17. After tempering himself, he went from the bar to the stage of ten thousand people. Xiao Jingteng had also been singing in the bar before participating in the talent show. There were also some bar singers who performed live. For example, some bar singers could quickly get into the mood when they sang classic English songs in the competition, and Han Hong personally played for them. There were also night singers who could still perform live "If" when their voices were broken. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>