Legend has it that one year, Luban accepted the task of building a huge palace. The palace needed a lot of wood, so he and his disciples had to go up the mountain to cut wood with axes. At that time, there was no saw, and the efficiency was very low. Once he went up the mountain, he accidentally caught a handful of weeds growing on the mountain, but he cut his hand at once.
Lu Ban wants to know why a grass is so sharp. So he picked a leaf and observed it carefully. He found many small teeth on both sides of the leaf. These little teeth are very sharp when he touches it gently.
Later, Lu Ban saw a big locust eating leaves in a meadow. The two large molds are very sharp. As soon as they opened and closed, they quickly ate a big piece. This also aroused Lu Ban's curiosity. He caught a locust and carefully observed the structure of its teeth. He found that locusts also had many small teeth on their two big dies, which were used by locusts to bite grass leaves.
These two things gave Lu Ban great inspiration. So he made a bamboo chip with many small serrations from a big bamboo, and then went to a small tree to do experiments. The result was really good, and soon a deep ditch was drawn on the trunk, which made Lu Ban very happy. However, bamboo can not be used for a long time because of its softness and poor strength. After pulling for a while, some small serrations are broken and some are dull, so it is necessary to replace bamboo.
Lu Ban thought of iron pieces and asked the blacksmith to help him make small serrated iron pieces. Lu Ban and his apprentice each pulled one end and pulled it up on a tree. I saw them coming and going, and soon I sawed off the tree, which was quick and labor-saving, and the saw was invented.
2. Five old Baishi people who are easy to paint.
Qi Baishi, a carpenter, became a painter by himself and won the World Peace Prize. However, in the face of his success, he was never satisfied, but constantly absorbed the strengths of famous painters of all ages and changed the style of his works. His paintings after 60 are obviously different from those before 60. After 70 years old, his painting style changed again.
After 80s, his painting style changed again. It is said that Qi Baishi had five relaxed painting styles in his life. It is precisely because the old man Baishi is still non-stop after his success that his works in his later years are more mature than his early works, forming a unique genre and style.
Sima Guang was playing with everyone in the backyard when a child slipped and fell into the water in the jar. Other children saw something was wrong and ran away, but Sima Guang used his quick wits to pick up a big stone from the ground and slammed it into the water tank. The water gushed out and the child was saved.
4. Copernicus' "Heliocentrism"
Under the threat of conservative forces such as the Holy See and the die-hards, Copernicus was not afraid of power and insisted on the truth. Put forward the "Heliocentrism" that changed the world. Copernicus' great achievements not only paved the way for modern astronomy, but also initiated a new era for the development of the whole natural science. Since the Copernican era, natural science and philosophy that got rid of the shackles of the church began to develop by leaps and bounds.
5. Shang Yang Reform
During the Warring States Period, Qin Xiaogong, king of Qin, was determined to reform and recruit talents. Shang Yang entered the State of Qin from defending the country, and put forward a set of reform and innovation development strategies, such as abandoning mineral fields, attaching importance to agriculture and mulberry, rewarding meritorious military service, implementing unified quantity and establishing county system, which won his trust and made him a regular.
In 356 BC and 350 BC, two reforms were carried out with the main content of "abandoning ore fields to open buildings, implementing the county system, rewarding farmers and fighting, and implementing the method of sitting together". ?
After Shang Yang's political reform, Qin's economy developed, and the fighting capacity of the army continued to strengthen, and it developed into the most powerful centralized country in the late Warring States period.