If you do not use your arms or your legs for some time, they will become weak. When you start using them again, they slowly become strong again. Everybody knows this. Yet many people do not seem to know that memory works in the same way. When someone says that he has a good memory, he really means that he keeps his memory in practice by using it. When someone else says that his memory is poor, he really means that he does not give it enough chance to become strong. Have you ever found that some people can't read or write, but usually they have better memories? This is because if they cannot read or they cannot write things down in a small notebook, then they have to remember them by heart. So if you want to have a good memory, learn from the people: practice remembering things in the way other people do.