Why do some people say that Leonardo da Vinci is a time traveler from the future? What is the evidence?

Why is Leonardo da Vinci said to be a time traveler from the future? Because he came up with a lot of advanced things, especially the things in his manuscripts, which were incompatible with the state of things at the time. People couldn't explain it. They could only say that he was a time traveler from the future.

Leonardo da Vinci is one of the three masters of the Italian Renaissance and the most perfect representative of the entire European Renaissance. He is a profound, knowledgeable and versatile painter, fabler, sculptor, inventor, philosopher, musician, medical scientist, biologist, geographer, construction engineer and military engineer.

In the picture of the fetus in the womb, Leonardo da Vinci discovered the function of blood, believed that blood plays a metabolic role in the human body, and believed that blood circulates continuously.

This was absolutely impossible at the time, but he actually drew it.

Da Vinci mastered the knowledge of human anatomy and studied the structure of each part of the human body starting from anatomy. He was the first to use wax to represent the internal structure of the human brain, and was the first to imagine using glass and ceramics to create hearts and eyes.

Due to his fascination with the phenomenon of flight, Leonardo da Vinci conducted detailed research on bird flight and planned several flying machines, including a helicopter operated by four humans (but because the machine itself was also will spin and therefore cannot function) and light hang gliders. On January 3, 1496 AD, he tested a self-propelled flying machine but failed. But there is nothing wrong with his design.

In 1490, Leonardo da Vinci sketched the concept of a continuously variable automatic transmission. Today, Leonardo da Vinci's transmission concept is actually used in cars in its modern form. In addition, continuously variable automatic transmissions have been used in tractors, snowmobiles, scooters, etc. for many years.

Since Leonardo da Vinci was a military engineer, his notes also include the design of several military machines: machine guns, man-powered or horse-drawn armed tanks, submunitions, military parachutes, breathing hoses, etc. Diving suits made of pigskin and more. However, he later believed that war was the worst activity of mankind. Other inventions include the submarine, a gear device that has been interpreted as the first mechanical computer, and the first programmable mobile robot that has been misunderstood as a clockwork car. In addition, during his years in the Vatican, Leonardo da Vinci planned to use solar energy to boil water using concave mirrors.

Four or five hundred years later, various designs throughout life were gradually proven to be feasible. How could such a person not be considered a time traveler in the future?