A boy sends me text messages every day.

If a man takes the initiative to send you messages every day and suddenly stops sending them to you, he will feel uncomfortable. This kind of psychology is normal. Don't be too surprised. This is just a habit. In other words, you are used to him sending you messages, so suddenly you will feel uncomfortable without hearing from him, so you will feel uncomfortable.

Many sales are based on people's psychology. They send some messages to customers every day, such as a simple hello, and they will stick to it. Slowly, customers will get used to their existence, and then invisibly close their relationship.

We have a new target.

Don't worry, although the information is uncertain, there are still ways to quantify it. According to the concept of information, people can conclude that information has the following characteristics:

1. The greater the probability P(x) of the message, the smaller the information; Conversely, the smaller the probability of occurrence, the greater the amount of information. As you can see, the amount of information (which we refer to as I) is inversely proportional to the probability of message occurrence.

2. When the probability is 1, everyone knows what happened, so the amount of information is 0.

3. When a message consists of several independent small messages, the information contained in this message should be equal to the sum of the information contained in each small message.

According to these characteristics, if expressed by mathematical logarithmic function, the relationship between information quantity and message occurrence probability can be expressed exactly: I=-loga(P(x)). In this way, can't the information be quantified? Since information can be quantified, should we give it a unit? People's weight is measured in kilograms, and people's height is measured in meters, so what unit should be used to measure the amount of information? Usually, the amount of information is measured in bits, which is more convenient, because the amount of information in a binary waveform is exactly equal to 1bit.