What You All Think About the Limits of Memory?

[LevelUP]

This isn't meant to be a deep discussion about the psychology of memory limitations. However, there are some humans living that can recall every single day of their lives. The real Rainman can memorize 98% of what he reads. There are memory masters who can train themselves to memorize a deck of cards in under 2 minutes.

It seems to me that as a hobby, it's hard to do multiple things at once, such as learning musical instruments or languages.

So in practical terms, what you do all think about the limits of memory? What about learning things as a career?