Luban invented the saw by observing thatch, Newton invented gravity by observing an apple falling, and Watt invented the steam engine by observing that the lid of a pot would be lifted by steam.
Lu Ban invented the saw:
Let’s say that one summer, the king of Lu Ban’s hometown Lu asked Lu Ban to supervise the construction of a palace for a period of three years. But Lu Ban and other craftsmen went to the mountains to cut the wood needed for the palace for three years, but they could not complete the task.
This made Lu Ban anxious, because the king's words were imperial edicts and could not be changed casually. If it really delayed the progress of the project, beheading would be inevitable. Lu Ban was so worried that he couldn't even sleep well.
In order to speed up the progress of cutting down wood, Lu Ban goes up the mountain in advance every day to select the trees to be cut down. On this day, as soon as it got dark, Lu Ban set off early in the morning and under the night dew.
In order to save time, Lu Ban took a small road. The road was close to the mountain, but the slope was steep and slippery, and it was covered with small trees and weeds. It was very inconvenient to walk. Lu Ban had to hold the trees and pull them. Climbing up on the thatch. Suddenly, the sole of his foot slipped, and his body rolled down the hillside. Lu Ban suddenly realized what he was doing and quickly grabbed a handful of thatch. However, because he did not have a firm grip, he felt extremely painful in the palm of his hand. Sliding to the foot of the mountain, Lu Ban climbed up in embarrassment. He stretched out his palms and saw that his palms were dripping with blood.
Lu Ban was very surprised why a handful of thatch could cut a person's hand. Lu Ban ignored the pain and climbed up the sliding hillside. He saw that the thatch was no different from other grass.
Lu Ban was unwilling to accept it, so he pulled off a piece of thatch and observed it carefully. The leaves of this thatch are very strange. There are sharp little teeth on both sides of the leaves. If you hold it tightly and pull it, your palm will be scratched. Luban tried to use thatch to pull on his finger again, and sure enough, another bloody opening was opened.
Lu Ban was about to lean over to explore the truth, when he suddenly saw a large locust nearby. Its two large fangs opened and closed, and it quickly ate the grass blades. Lu Ban caught the locust and took a closer look. He found that the large teeth of the locust were also lined with many small teeth.
Lu Ban was inspired by these two things and thought: If we imitate the fine teeth of thatch and locusts and make a tool with fine teeth on the edge, wouldn't it be better than an ax to saw trees? Is cutting faster and better?
Lu Ban forgot about the pain, turned around and went down the mountain to start experimenting. With the help of a metal craftsman, Luban made an iron bar with many fine teeth. Lu Ban used this tool to saw the tree, and it was indeed fast and labor-saving. This is how the saw was invented.
Newton invented gravity by studying the principle of apple falling to the ground.
Watt invented the steam engine by observing that the lid of a kettle would be lifted by steam.
These inventors who have gone down in history were inspired by the little things that ordinary people did not pay attention to, and thus became a generation of great men and made a strong contribution to the progress of mankind.