memorizing Pi

bump into this video and amazed by the boy’s strong memory! how did he manage to do that?

http://www.youtube.com/watch?v=j7RXQbr5p4Y

Wow. I’m lucky if I can remember my phone number. LOL

Amazing, i can’t figure someone remembering all thos numbers even with a lot of practice.
Maybe he memorized them with a certain rhythm? it looks as if he was singing a song?
Anyway, excellent memory.