Around 120 years ago, Embinhouse began his study of memory. He concentrated on studying how quickly the human mind can remember information. One result of his research is known as the total time hypnosis which simply means the mount you learn depends on the time you spend trying to learn it. This can be taken as our first rule of learning. Although it is usually true that studying for four hours is better than studying for one, there is still the question of how we should use the four hours. For example, is it better to study for four hours straight or to study for one hour a day for four days in a row. The answer as you may have suspected is that it is better to spread out the study times. This phenomenon through which we can learn more efficiently by dividing our practice time is known as the distribution of practice effect. Thus our second rule of learning is this: it is better to study fairly briefly but often. But we are not finished yet. We haven’t considered how we should study over very short periods of time. Let’s say you are trying to learn some new and rather difficult English vocabulary using a stack of cards. Should you look at the same words in rapid succession or look at the word and have some delay before you look at it again. The answer is it is better to space out the presentations of the word you are to learn.