I believe electronic devices are the most important invention in 20 century. Because it is so close to our daily life and completely changed our society. Have you heard about EM bomb? It is a bomb that can burn out all electronic devices without killing people. Many governments are restricted that kind of bomb, although it is not harmful to human. We can see how important electronic devices affected us.
Electronic devices are important because of the programming power. A program can handle special situation when designed input was detected. Like in the supermarket, when the bar code scanner detected a code, the price and the information of the goods were shown up in the screen and calculated the total price. That is the power of programming. Nowadays, nearly almost anything can be programmed. And it saves a lot of time.
Electronic devices also have the power of calculation. It can do million and million calculations in just 1 second. The influence is deep and width. In logistic industry, hundreds and hundreds of goods and cargos are needed to be transported. With the help of electronic devices, every goods and cargos are labeled with a signal emitter, when someone needs to check how many things are in there, they simply check how many signals were received and compare it to the database. It cannot be done within few seconds in the past. Another example is research and stock markets. Researcher can now study some difficult and complex problem by the aid of computers. The stock markets need to process a lot of trading in a short time. All of this cannot be done without electronic devices.
Today, we can see electronic devices are everywhere. In the car engine to cell phone, from shopping malls to stock markets, from entertainments to research fields, none of these are able to work in modern society without it, not just because it is convenient, but also it can handle massive calculation.
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