The characteristics, universality, dependence, sharing and timeliness of information.

Universality: Information is everywhere. There are information everywhere around us, such as class bells, traffic lights, things we see and hear every day.

Dependence: The bonfire lit by soldiers is not the information itself, but the meaning it contains is the invasion of foreign enemies, which is the information. The bonfire is only the carrier to express and transmit information.

Sharing: Bernard Shaw has an image metaphor for information sharing:

You have an apple and I have an apple. If you exchange with each other, we still have an apple. If you have an idea, I have an idea. If we communicate with each other, we all have two ideas, or even more.

This example shows that information will not be reduced by sharing, but can be obtained from sharing.

Timeliness: for example, the weather forecast is only useful for a few hours, and then it becomes invalid.

For example, a book or information of Qin Guojun unearthed in Xianyang two thousand years ago now seems to be a piece of waste paper. Do you have any ancient examples?

For example, tomorrow's yellow flower is a metaphor for outdated or meaningless things. Later, it was a metaphor for a report that lost its news value or something that lost its timely effect.