In May of 1928,
Alexander Luria, a Russian neuropsychologist, got what was probably one of the greatest shocks of his life.
A man with a perfect memory had just walked through his office door. The man's name was
Solomon Shereshevskii, and he remembered absolutely everything that had happened him from the age of one until his then age of 40.
The sceptical Luria asked Shereshevskii, once he was comfortable, to recite a list of 30 random numbers that Luria had scribbled down on a piece of paper. To Luria's astonishment, Shereshevskii did it perfectly -- and then did it backwards.
Comment: And if you're concerned about getting diseases, then eat a healthy diet and take Vitamin A and D supplements, especially during the winter months.