Article about human memory

Yesterday I read article about human memory. It was very interesting article, I learned many new things which were for me. For example, human memory is very changeable. We can differently describe one and the same event in our life differently throughout/over a some period of time. If something bad occurs in our life in the one morning, in by the evening it may seems, that it happened many times long ago. A soviet mnemonist Shereshevsky was described in this article. He was an unicum, because his memory seemingly had no any limits. He can could (you are using past tense, stick to it) memorize 20, 30, 50 or more numbers or words at the same time, and can could repeat them after many years, in any stipulated order, without any mistakes and in any order. It was funny/amusing for me to be told that this man had a bad memory for human faces. Our memory is really very interesting and poorly understood/researched learned.