Six lost stunts in the world

Stunt juéjì [stunt; Exquisite skills] Unique and superior skills; Extremely high skill; It is difficult for others to learn skills. Here are six lost stunts in the world that I brought for your reading.

The world's six lost stunts 1 There have never been so many advanced technologies in this world, but this does not mean that we have not lost anything along the way. Many ancient technologies, inventions and manufacturing processes are gradually lost over time; However, some technologies are still not fully understood by modern scientists.

Greek fire

Perhaps the most famous of all the lost technologies is Greek fire. It was an arson weapon used by the Byzantine imperial army; It is the original form of napalm, and Greek fire is a kind of "sticky fire", which can continue to burn even in water. Greek fire can be effectively used in many different ways. The earliest form was to pour it into a jar and throw it at the enemy like a Grenade or incendiary bomb. Later, huge bronze pipes were installed on warships, and people used siphons to spray incendiary agents on enemy ships.

How did you lose it? Of course, people are not completely unfamiliar with the technology behind the Greek fire. After all, the modern army has used similar weapons for many years. However, the napalm closest to Greek fire was not perfected until the early 1940s, which means that this technology has been lost for hundreds of years. With the decline of the Byzantine Empire, this weapon seems to have disappeared, but the reason is unknown. Early theories showed that the mixture of combustible materials contained a lot of saltpeter, which made it similar to gunpowder in chemical properties. This theory was rejected because saltpeter can't burn in water. On the contrary, modern theory shows that it is more likely to be a mixture of oil and other chemicals, which may include quicklime, saltpeter or sulfur.

Roman cement

The development of modern concrete began at 1700. Today, cement is the most widely used building material in the world, but the formula developed in18th century is not the first invention of concrete. In fact, in ancient times, concrete has been widely used by Persians, Egyptians, Assyrians and Romans. Among them, the Romans are the most important. They took the lead in mixing forged stones with crushed stones and water to improve the formula. Their mastery of this skill enabled them to build pantheon, arena, ditches and Roman baths.

How did you lose it? Like many technologies in Greece and Rome, the concrete formula of Roman cement was lost in the dark ages, and why it disappeared is still a mystery. The most popular view is that its formula is the trade secret of masons, and the manufacturing methods of cement and concrete disappear with the death of those masons. More interestingly, buildings built with Roman cement still stand for thousands of years, while Portland cement, the most commonly used cement, is much faster. There is a theory that the Romans added different chemicals, including milk and even blood. It is said that these things can generate bubbles in cement, help cement expand, and resist cold and heat without damaging itself. [-(@_@)-]

Compass grass

The loss of technology is not always due to excessive secrecy or poor records, but sometimes it is only due to natural uncooperative, as is the case with Compass Grass. This flowering herb only grows on the specific coastline of Libya today. The heart-shaped fruit of the compass is considered as a panacea, which can be used to treat warts, fever, indigestion and all other diseases. Its contraceptive function makes it one of the most precious substances in the Roman world, and this herb even appears in several different ancient Roman currencies. Drinking compass grass juice every few weeks is enough for women to prevent pregnancy. If used properly, it can even terminate pregnancy. Using compass grass may be one of the earliest methods of induced abortion.

How did you lose it? Compass grass is one of the most popular herbs in ancient times, and its use quickly spread to Europe and Asia. However, due to its remarkable efficacy and special growth environment, people have been over-cutting, leading to the extinction of compass grass. Because this particular variety no longer exists, modern scientists can't confirm whether its contraceptive effect is as remarkable as that of Roman historians and poets, or whether it will have other side effects. However, other herbs with similar chemical properties have been proved to have a fairly high contraceptive rate.

damascus steel

Damascus steel is an extremely tough metal, which is widely used from 1 100 to 1700. The fame of Damascus Steel is related to the sword. The blade forged with Damascus steel has amazing strength and cutting force. It is said that it can cut rocks and other metals in half. It is said that Damascus steel is forged from Indian "Jian Zihao ingot". When this steel is cast into a sword, its surface will form a special pattern. The patterns on Damascus steel knives are basically made of two different materials. The bright place is pure white carbon iron, which is harder than glass; The dark part belongs to Vostian Iron and Bolaitie Iron, which has high toughness. The combination of soft iron and hard iron makes the sword tough and sharp.

How did you lose it? The forging process of Damascus steel seems to have disappeared around AD 1750. The exact reason for the loss of this technology is not clear, but there are several theories. The most popular thing is that the demand for special minerals for Damascus steel is in short supply, and swordsmen are forced to develop other technologies. Another way of saying this is that the whole formula of Damascus steel, especially carbon nanotubes, can only be discovered by accident, and the swordsmen don't know all the technologies. Instead, they just cast a large number of swords and tested them to determine which ones meet the standards of Damascus steel. [-(@_@)-]

Antichi Sheila mechanism

Antikythera device is one of the most mysterious archaeological sites. This is a bronze device found by divers in the wreckage of an ancient ship on the Greek island of Antikythera more than 0/00 years ago. The device consists of a series of controllable copper gears (more than 30), cranks and dials, and is used to calculate the running positions of the sun, the moon and other planets. Scientists have calculated that this device was made between 1 century BC and the 2nd century BC. At present, scientists do not fully understand its real use, and the mysterious structure and use behind it have also puzzled researchers for many years. Now it seems that the Antichi Sheila device is a primitive clock, which can calculate the phases of the moon and the solar year, which makes some people call it the earliest "analog computer".

How did you lose it? The complexity and accuracy of equipment design show that it is not the only equipment of this type. Many scientists speculate that its use may have been very common at that time. However, in historical records, equipment similar to the Antikythera device did not appear until the14th century. This may mean that this technology has been lost for nearly 1400 years. As this is the only ancient discovery of this device, why or how it was lost will remain a mystery.

Wuyou medicine

The advanced technology possessed by the ancient Greeks and Romans is often surprising, especially in medicine. In addition to other medical knowledge, the Greeks also know how to use "worry-forgetting medicine" to help those who have just lost their loved ones. "Worry-forgetting medicine" is a primitive antidepressant, which can "drive away sadness". This drug is often mentioned in Greek literature, such as Homer's Odyssey. Some people claim that it may be fiction, but most people think that this drug did exist in ancient Greece and was widely used. It is said that "worry-forgetting medicine" originated in Egypt, and its "forgetfulness" effect makes many people compare it to opium or tincture of opium.

How did you lose it? Usually, this "lost" technology may still exist today, but we are not sure what their modern counterparts are, which makes them so mysterious. If this situation does exist, "worry-forgetting medicine" can be one of them. This drug is most likely to be used today, but historians are not sure what modern substance the ancient Greeks used. Opium is definitely the most popular choice, and other popular candidate drugs include wormwood extract and scopolamine.

As the saying goes, "one move is fresh, and you can eat all over the world." In the NBA, if a star wants to make a name for himself, he must have his own killer skills, which are practical enough for all players to imitate. For example, big dream steps, Jordan's back jumper, Nowitzki's golden rooster independence and so on.

But there are still some stunts that are difficult to use, or far away from now, lost or already lost. Today, we will experience some classic stunts active in historical images through pictures!

1, Crawford jumper

Crawford hasn't returned to the NBA since 19 left the Suns. Many people think that he should not retire. After all, he scored 5 1 point in the last game of the Suns!

Another reason why fans don't want him to leave the NBA is that too many gorgeous moves are not fully understood. Among them, his classic jump shot "shake roast" has not been used by many people in today's NBA, and it is facing loss!

2, Thomas fingertips control the ball

In the 1980s and 1990s, the stadium was full of powerful big men. How can an Isaiah Thomas of 1.85m stand out? On the one hand, his strong defense, on the other hand, his ball control skills.

Friends who have seen Thomas's highlights will sigh: "This man dribbles really low!" When Thomas passed the ball, the dribbling height hardly exceeded the knee. He just touches the ball with his fingertips, plus his small size and excellent speed, it is too difficult for others to break his ball. In today's league, it is rare to see an assassin who can dribble as low as a smile.

Iverson changed his direction.

Not long ago, there was a saying circulating on the internet: Owen passed people a hundred times, and Iverson passed you a hundred times. And Iverson's way is his stunt-crossing.

He will quickly break to the left, then quickly pull back, and then break the layup to the right. Maybe everyone knows that he will turn right, but he will be confused by Iverson's first fake action. This is the charm of this move. After Iverson, I'm afraid no player in the NBA can do this action so smartly.

4, obstacle urinal free throw

The above action may be because it is difficult and the player can't inherit it well, but Barry's urinal free throw may be because it is not very beautiful!

This action is often used by beginners who are new to basketball. But you can't underestimate this action. Barry made a career 90% free throw percentage with this free throw posture.

5, Gwen fingertips to pick a basket.

The above actions are lost, and some people will use them from time to time; Then all the stunts below are lost!

The average player's center of gravity is unstable after hitting the pull rod. Generally, he chooses to hit the board and spin the basketball for layup, but it is easy not to go in. Godwin, the famous Iceman of the Spurs, often uses his fingertips to pick the basket, which can change the direction of the ball and easily throw it into the basket high without hitting the backboard.

6. shark back play

Low back play is a compulsory course for centers, but now almost all centers will add a small hook with a big dream step after back play, which is really a little tired of watching.