Once upon a time, the son of an old rich man had a rich man who could not read, so he hired a gentleman to teach his son to read.

When Mr. Wang comes, teach the rich man's son to draw red first. With a stroke of his hand, Mr. Wang counted "this is the word' one'"; After two strokes, Mr. Wang taught "this is the word' two'"; After three strokes, Mr. Wang taught "this is the word' three'"

As soon as the word "three" was written, the rich man's son went to his father with a smile and skipped, repeatedly saying, "It's too easy, it's too easy, I already know all the words, so I don't need Mr." The local rich man was naturally very happy. He saved more money by quitting his husband.

Soon, the rich man invited a man named Wan to drink and asked his son to write an invitation. Unexpectedly, after a long time, my son still didn't work, so I had to go to the study.

When I got to the study, I saw my son sweating profusely. When I met him, I complained, "This guest's name is so strange. Why not call him Wan? I've been busy since early in the morning and only rowed more than 500 times. I just took the broom and rowed quickly. "

Don't laugh at them. Speaking of it, our ancestors did the same thing when they first started counting.

Let's take a look at the earliest national counting symbols in the world. The first few numbers are almost the same, all hieroglyphics.

The discovery of Oracle Bone Inscriptions at the beginning of this century is a great event in China culture. There are more than 4,500 Chinese characters on it, of which less than 1000 can be recognized, including a lot of mathematical data. The symbols representing 1, 2, 3 and 4 are:

This goes back to the Shang Dynasty 4000 years ago.

Also in ancient Egypt as far back as 3000 BC, the inscriptions carved on stones by Egyptians were hieroglyphics, and sometimes these words were written on other materials, such as papyrus, wood and pottery. The representatives of 1, 2, 3 and 4 are:

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They are all vertical sticks.

The early Babylonians lived in the Euphrates River and Tigris River, which is now Iraq. They don't have papyrus, and I'm afraid there aren't many tortoise shells, and even carved stones are hard to find. They mainly write in clay.

Carve words on the wet clay board with a hard pen. The tip of a hard pen is a sharp isosceles triangle. Tilt the hard pen slightly, print a wedge on the clay board, and then dry the written book board to make it hard and durable for long-term storage.

extreme

The revelation of glass is to do experiments with a simple and interesting glass bottle, hoping to analyze the flaw of Xiaohua's lying.

Xiaohua is a greedy child and likes candy best. His parents want him to give up this hobby, especially by rewarding and punishing him. Their method-if you study hard, use a candy as a reward; On the contrary, put the sugar on the table and don't eat it.

One day in the summer vacation, Xiaohua wanted to eat candy again, so she begged her mother to give him a candy to eat. Seeing that he didn't finish his homework, his mother refused.

Who knows, when her mother went to the market to buy food, Xiaohua took this opportunity to steal candy with a chair, but accidentally broke the pig glass bottle.

Xiaohua's mother bought food and went home. She saw glass fragments everywhere in the living room, but the pig glass bottle on the stage was gone. Xiaohua's mother knows what is going on. However, Xiaohua said to her mother, "I just poured boiling water into the pig glass bottle, but the glass was broken because of the heat."

Mother touched the glass on the ground and was very angry when she knew Xiaohua was lying. She scolded him and said, "Xiaohua, mom knows that you stole candy and accidentally broke the glass bottle, and you still want to lie?" You are really a bad boy! "

From Xiaohua's mother's words, can you find out the flaw in Xiaohua's lying?