Many people answered very well, mentioning Yuan Chonghuan, Sun Yat-sen, Kang Youwei and Liang Qichao, well-known children of noble families. This time, I want to mention two historical figures who have been ignored by everyone but have made special contributions in the history of science and technology in China: one is Chen Yi, who introduced sweet potatoes; One is He Ru, who introduced and copied a new type of weapon-"Franz cannon".

Chen Yi was the first person to introduce sweet potato into China in Ming Dynasty. Chen Deyu is a native of Humen North Gate. In the eighth year of Wanli in Ming Dynasty (1580), Chen Yi and his friends went to Annan (now Vietnam). The local chief is very polite to him, and there are delicious sweet potatoes at every banquet. However, local laws prohibit potato seeds from leaving the country. Chen Yi "dredged" the toast slaves with money and goods, got potato seeds with their help, and smuggled them back to China in the 10th year of Wanli (1582). He first propagated potato seeds in Huawu, and then bought 35 acres of land in the ancestral grave to expand the seeds. Because the potato seed comes from Fanbang, it is named "sweet potato". "Since then, sweet potatoes have been planted all over the south," which has become people's main miscellaneous grains. Chen Yi introduced sweet potato from Annan 12 years earlier than Fujian Chen Zhenlong, and was the first person to introduce sweet potato in China. In the 20th year of Wanli (1592), when Chen Yi died, he wrote a suicide note to future generations, telling them that there must be sweet potatoes in every sacrifice, which was followed by future generations in Chen Yi.

The introduction of sweet potato has changed the agricultural structure of China, which is of far-reaching significance. The introduction of sweet potato changed the relatively single grain planting structure in southern China, and almost changed the food chain of people and livestock under the shortage of cultivated land and frequent famine. In the history of China, the population generally fluctuated by tens of millions of people, ranging from several million to 50 million to 60 million, and nothing exceeded 1 100 million. But in the Ming and Qing dynasties, the population suddenly surged, reaching more than 100 million. During the Qianlong period, the population has exceeded 300 million, precisely because of the contribution of agriculture. Some experts believe that the population growth in China is related to the large-scale cultivation of this sweet potato. The introduction of sweet potatoes saved many lives in the famine year. Chen Yi, the first person to introduce sweet potato, contributed a lot, and his achievements are greater than those of Yuan Longping now. There is no doubt that Chen Yi's introduction of sweet potato has made great contributions to the development of China's grain economy.

He Ru, also a legend and a Humen, took the lead in copying the French gun. French machine was invented in Europe, and was introduced to China from Portugal in the first year of Jiajing in Ming Dynasty (1522). According to its country name, it is called "French Machine". In the third year of Jiajing (1524), the Ming court successfully copied the first batch of 32 French patent machines, each weighing about 300 Jin, with a female spear 2.85 feet long and four sub-spears. Later, the Ming court successively copied French machines of various sizes and models, and equipped them with northern and coastal troops. In the first year of Jiajing in the Ming Dynasty (1522), He Ru, then an inspector in Baisha, Guangdong Province, saw a new type of artillery with a range of 2,000 feet on a Spanish and Portuguese merchant ship moored at Humen. At that time, Portuguese sailors wanted to "shine" in front of He Ru. When they saw a China official circling around their powerful cannon, they even swaggered and practiced on the spot, thinking that they could "shock" He Ru. He Ru was overjoyed, secretly drew drawings and operating principles, and immediately ordered the craftsmen in Humen to imitate them after returning. "With copper, there are five or six feet long, the big one has more than one thousand catties, and the small one has one hundred and fifty catties. It has a big belly, a long neck and a hole in its abdomen. Take five tablets, store the medicine and put it in your stomach. Hair and more than a hundred feet. " Made the first batch of these powerful weapons. One year, Portuguese sailors robbed fishermen off the coast of Guangdong, and the Ming navy went into battle to fight with Portuguese armed forces in Humen. He Ru's imitation gun actually suppressed the authentic "Frank gun", and the Portuguese were defeated and fled in haste. After that, the "French Gun" was copied in large quantities, and in the years to come, it fought against the pirates and pirates. During the Chongzhen period, Yuan Chonghuan killed the Taizu Nurhachi of the Qing Dynasty with his "Folangji Gun", and made great achievements. In the following years, the "Frankie Gun" was even used until the end of the Qing Dynasty and played a role in the battle against the Western allies.

Text/question seeker