An "e-book" that uses CD instead of paper has come out. An "e-book" is a small compact disc, which uses characters, images and sounds converted into electrical signals as storage devices, and uses a computer to read the contents when reading. A CD with a diameter of 12 cm can store newspaper contents of 1 year. All books, newspapers, archives and documents in human history have been recorded as CDs, which can be packed and taken away by a van.

To see what is recorded on the CD, just insert the CD into the drive, that is, a device similar to a video recorder, and then press the keyboard of the microcomputer connected next to it several times, and what you want to see will appear on the screen of the microcomputer. Very easy to use, you can learn it in a few minutes.

Although the information capacity of CD is very large, it is extremely fast and simple to retrieve and extract the information inside. A CD contains 200,000 to 300,000 pages of text information. You can find an article, a sentence or even a word in it at will, and you can find it in a second or two with a few buttons. If we want to count how many frontier wars have been fought in China's history, turning over a set of twenty-four histories for more than a month cannot guarantee that there are no omissions. But if you record the twenty-four histories into a CD, as long as you press the keyboard 1 sec, the sources and statistics will come out.