Who is the man with the best memory?

Answer 1

A Russian journalist named Solomon Veniaminovich Shereshevsky (or Shereshevskii) is the best one to my knowledge...

He remembered everything, even long lists twenty years after hearing them once.

Answer 2

A Japanese psychiatric counselor has recited pi to 83,431 decimal places from memory, breaking his own personal best of 54,000 digits and setting an unofficial world record, a media report said Saturday.

Akira Haraguchi, 59, had begun his attempt to recall the value of pi - a mathematical value that has an infinite number of decimal places - at a public hall in Chiba city, east of Tokyo, on Friday morning and appeared to give up by noon after only reaching 16,000 decimal places, the Tokyo Shimbun said on its Web site.

But a determined Haraguchi started anew and had broken his old record on Friday evening, about 11 hours after first sitting down to his task, the paper said.

Answer 3

I knew, but I've forgotten.