Our memory is quite an unreliable storehouse of the data, its contents may change affected by new information. Some of the events linger in our memory for a long time, others fade very fast. On the other hand if we have remembered everything, then finally our brains would fail to discern primary from the secondary and its activity would be completely paralyzed. That is why our memory is not only the ability to remember but also to forget. Scientists distinguish three types of memory: spontaneous, short term and long term. Spontaneous memory (direct memory) keeps the information for about 1/4 seconds, and if its signals do not attract highest parts of the brains the information is erased and direct memory is filled with new signals. Short term memory lasts for 20 seconds. If the data is not introduced once again, it vanishes with no noticeable trace. The research showed that short term memory considerably improves at the age of 5 11. Then up to 30 it remains on the same level. Later from 30 to 70 it can either progress or degenerate. Strong emotions also influence the memory characteristics. Sometimes we memorize some events because of their emotional significance to us, even...