Solomon Shereshevskii is Russian journalist and mnemonist, multiple synesthesia. Sherevskii's fivefold synesthesia on how he used his synesthesia to perform feats or memory including memorizing complex mathematical formula. Huge matrices and even peoms in foreign languages. He was burdened by his inability to forget even the the most trivial details. This is so cool as you won't forget anything! As I tend to forget things and if i were him, I will be able memorize stuffs for my exams well. But if I had a bad memories, I won't be able to forget them...and that's sad as you will remember it for life.