N 17 century British scientist Newton (1642- 1727) founded mechanics. Newton himself, as the father of mechanics, is one of the few scientists who have made epoch-making contributions to human civilization in the history of the world.
Before Newton, it was generally believed that objects in the sky and objects on the ground had different laws of motion, one moving in a circle and the other in a straight line. But Newton proved that no matter what objects in the sky or on the ground, they must follow the laws of inertia, particle motion and action and reaction, which is the so-called "Newton's three laws" movement. He also clearly pointed out that it is the attraction between celestial bodies that drives the planets to move around the sun. Newton also first put forward the idea of launching artificial satellites, and he and Leibniz invented calculus at the same time.
Newton also found that white light is actually a mixture of seven different colors of light: red, orange, yellow, green, blue, indigo and purple. But he always said modestly that my achievement is the result of standing on the shoulders of giants.
Darwin, the founder of biological evolution
N British scientist Darwin (1809- 1882) put forward the theory of biological evolution. Darwin loved nature since childhood and liked to collect animal and plant specimens. He carefully compared various animals and plants and found that all species evolved from the same ancestor. After years of research, an epoch-making scientific masterpiece The Origin of Species was published in 1859. He proved the evolutionary thought of "natural selection, survival of the fittest" with a large number of facts. In memory of the founder of this discipline, people call evolution "Darwinism".
Hua worked until the last day.
N1985 June 12, at an international academic conference in Tokyo, 75-year-old Professor Hua (191985) used fluent English, and after giving a wonderful report, he collapsed.
Hua Luogeng made an in-depth study of number theory and got the famous Fahrenheit theorem. In an interview, when a reporter asked him, "What is your greatest wish?" Without thinking, he replied, "Work until the last day." He really fulfilled his promise.
This is a science and technology tabloid I wrote myself, and I collected a little history of science and technology and shared it with children. Do you like it?
1. Do you know where the first expressway in the world is?
The modern superhighway in the world appeared in Germany 1932. After Germany, the United States built a highway 1937 in California. But do you know where the first expressway in the world is? It was born in the land of China. This "expressway" starts from the foot of Yinshan Mountain in Baotou, Inner Mongolia in the north and ends in the north of Chunhua County, Shaanxi Province in the south. It was built in the Qin Dynasty more than 2,000 years ago. Now the total length is about 700 kilometers, and the average width of the road surface is about 30 meters. Because the road is generally straight from north to south, it was called "straight road" at that time. The record of the straight road in Qin dynasty was first seen in Historical Records.
Step 2 be eclipsed
Every time the moon moves between the earth and the sun and the three celestial bodies are connected in a line, a solar eclipse will occur (see figure 1). The moon blocks the sunlight, causing a shadow on the earth, which makes some areas unable to receive part or all of the sunlight. As for how small the sun is covered by the observer, it depends on their position relative to the shadow of the moon. If observers are in the penumbra, they will see a partial solar eclipse, while people in the umbra will see a total solar eclipse.
3, the history of the telegraph:
Now that we have telephones and computer networks, telegrams are seldom used. Maybe the children don't know. But this is a very big invention at the end of 18. 1793, the Chape brothers in France set up a 230-kilometer-long support line between Paris and Lille to relay information. This is a communication system consisting of 16 signal towers. The signalman controls the different angles of the bracket through the rope and pulley at the bottom to express relevant information. At that time, France and Austria were at war, and it took only one hour for the signal system to transmit the news of Dai Shengli-on-Aceh from the Austrian army to Paris. Later, Belgium, the Netherlands, Italy, Germany and Russia also established this communication system. It is said that one of Chapei's two brothers was the first person to use the word "telegram".
chang'e 2 satellite
Chang 'e-2 is the leading star of the second phase of lunar exploration in China, and has accumulated engineering experience for the second phase. In addition to "flying directly" to the moon, Chang 'e II can also improve the resolution of the moon image from120m to10m. He revealed that because Chang 'e II has a higher resolution, it will be able to see the traces left by human beings on the moon in the past, including China people. He pointed out that the main purpose of Chang 'e series satellites is to explore the moon. At present, Chang 'e-3 is also progressing smoothly, and the development of the scheme stage has been completed, and it has entered the initial sample development stage of technical testing. "The initial sample stage can be completed in about 1 to 2 years, and then it will enter the normal sample stage. According to the plan, it will be launched before 20 13 and eventually land on the moon. " Why does sorbet get angry?
The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it comes to cold sorbet, it will liquefy into droplets when it is cold. It seems that the sorbet is bubbling.
Why do sunflowers always face the sun?
Sunflower stems contain a wonderful auxin. This auxin is very afraid of light. When exposed to light, it will go to the backlight side and stimulate the cells on the backlight side to multiply rapidly. Therefore, the backlit side will grow faster than the bright side, causing the sunflower to bend towards light.
Why does cicada shed its skin?
Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough.