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What ancient wisdom shocked modern people?
1, dental drill indus valley civilization has evidence of dental surgery as early as 7000 BC. This earliest dental operation involved using a drill to treat teeth. The appearance of this ancient dental tool shows that the method used by the ancients is reliable and effective.

Plastic surgery Plastic surgery is one of the oldest surgical operations. Nose reconstruction surgery may have existed in ancient India as early as 2000 BC. At that time, nose amputation was a form of punishment, so that people invented a method of nose plastic surgery with a part of forehead, which is still applicable today.

3. Central heating system Some cities in ancient Roman civilization began to use central heating system around 1000 BC, which conducted the air heated by the stove through the space under the floor and then came out from the pipes in the wall. This is the heating system of kang. Kang heating system is used for heating public bathrooms and private houses. The floor is lifted off the ground by pillars, leaving a certain space in the wall. The hot air and smoke from the stove pass through these bounded areas and come out from the smoke vent on the roof, so that the room can be heated without polluting it.

4. Metrology and Calibration Scientists' archaeological research on the Indus ruins shows that the residents of indus valley civilization invented an advanced standardization system using weights and measures. This technical standard directly leads to the popularization of measuring instruments for angle measurement and architectural measurement. The measuring equipment also includes a balance and many parts of some equipment. The earliest examples of these standardized measurements are length, time and weight.

5. Perfume Recently, archaeologists unearthed what is considered to be the oldest perfume in the world in Cyprus. This perfume can be traced back to more than 4000 years ago and was discovered by an ancient perfume shop. Archaeologists found at least 60 stills, The Mixing Bowl, funnels and perfume bottles in this 4,000-square-meter factory. At present, scientists have synthesized four kinds of perfumes based on the perfume residues found in this site.

6. A study by Federick Formenti of Oxford University and Albert Minati of Milan University found that roller skates were invented by Finns. 5,000 years ago, they made the earliest skates from animal bones. Roller skates are very important for Finns, which can help them save energy when hunting in severe winter. The earliest skates using metal sheets were found in Scandinavia, dating back to AD 200. This kind of skates connect copper strips under leather shoes.

More than 2000 years ago, this battery was found in the ruins of a Parthian village from 248 BC to 226 BC. It consists of a 5.5-inch-high clay container, a copper column and an iron oxide. Experts concluded that this kind of equipment can generate electric charge as long as it is filled with acidic or alkaline liquid. Experts believe that this ancient battery may have been used by the ancients to gild objects.

8. Cement ancient cement in BC 1095 is about 750 miles from the east coast of Australia. There is an island called pine tree. There are more than 400 ancient tombs similar to anthills on the island. They are made of sand and stone, 8 to 9 feet high and 300 feet in diameter. Nothing grows on the tomb, and no remains can be found in the tomb. Archaeologists only found an upright concrete cylinder in each of the three ancient tombs. These cylinders vary in diameter from 40 inches to 75 inches. These cylinders were measured by radioisotope carbon measurement, and their ages ranged from BC 1095 to BC 100.

9. Mysterious metal sphere 1885, someone actually dug up a semi-elliptical metal tube in a Cretaceous stratum with a history of 65 million years in France, which was obviously "handmade". 19 12, employees of a power plant found a tin can inside when they smashed a large lump of coal. Miners found an iron nail in the stone of a quarry in Jinggudi, Scotland. According to the identification, the formation time of these rocks is much earlier than the time of human birth.

10, ancient model airplane 1898, a model very similar to modern airplane was found in an ancient tomb in Egypt more than 4000 years ago. This model is made of a small fig tree and weighs 31.5g. Later, the airplane model 14 was found in other parts of Egypt. What is even more surprising is that in some places in South America, some airplane models very similar to those in ancient Egypt have been found. Is there any internal connection between Egypt and South American airplane models? Have Egyptians ever flown to South America? Since people invented airplanes 4000 years ago, why didn't the world's first airplane appear until 1903? How did the ancients make airplanes? The ancients were extremely clever, and we still need to keep exploring in modern times.