What changes have been brought about by technological development in the 20th century?

Technology has brought too many changes to people. For example, the earliest invention of gunpowder enabled humans to split mountains and open roads, build bridges, and build buildings, which promoted the development of various undertakings, and the military industry also developed rapidly; the advent of papermaking and printing technology gave humans the conditions for writing, and promoted people's culture and art. Extensive exchanges of language, technology, economy, etc.; the invention of the compass promoted the development of navigation and trade, completed the geographical discovery, and enabled humans to understand the earth; the current scientific and technological achievements of hybrid rice and super rice have increased food production , solving the problem of feeding the world's population; space shuttles like Shenzhou V, Shenzhou VI... these space shuttles help astronauts land on the moon, explore Mars, and roam in space; artificial satellites provide us with satellite cloud images and weather forecasts, and can also broadcast TV signals; robots can do many things that humans cannot do, such as diving into the deep sea to investigate, and breaking into fires to rescue people; maglev trains are extremely fast, saving time for people to travel; people use atomic energy to generate a lot of electricity...

In the 20th century, humans invented many items that are useful to us, such as telephones, computers, televisions... These items make it very convenient for modern humans to do some things.

Two people are thousands of miles apart, but as long as they pick up the receiver and dial a few numbers, they can hear each other's voice and communicate verbally in just a few minutes. This is what the telephone has brought to human beings. Come the miracle. The telephone has been invented for more than 100 years. In modern society, it has become an important part of people's work and life. For example, if grandparents are sick, just make a phone call and remind them what medicine they should take or what they should pay attention to if the illness is not serious. In the 20th century, it was the telephone that brought us convenience.

Having a phone is not enough. Human beings invented computers again. Computers are better than telephones. Telephones can only hear the other party's voice, but computers can communicate through text. You can also make video calls online and see the other party. If there is any holiday, send an E-MAIL and the other party will receive it in a few seconds. This not only saves paper, but also allows others to receive it quickly.

Mankind has a lot to remember in the past century, among which many great scientific and technological inventions and innovations have brought about earth-shaking changes in our lives, and the predictions of thinkers often come true. American scientist Franklin once said: In the future, human knowledge will increase greatly, and new inventions that we can't imagine today will appear frequently. Sometimes I almost regret that I was born too early, so that I can't know the new things that will appear. What he said was true. In the past 100 years, human science and technology can only be described by words such as rapid advancement. If an inventor in 1900 were to look at the world today, he would recognize cars, telephones, and airplanes, and he could also imagine spaceships and deep-sea submarines. , but he knows absolutely nothing about computers, the Internet, genetic engineering, or nuclear energy. Now, the explosion of knowledge has given mankind unprecedented confidence and optimism. A writer wrote: "I sincerely believe that we are living in the greatest era of knowledge in human history. There is nothing that we do not understand." "As long as people can think of it, There is always someone who can do it.” The development of science and technology in the 20th century makes this sentence more and more true. Scientific and technological progress has completely changed the way human beings live and also changed the direction of human thinking.