Usually when trying to learn something new I need to repeat the information multiple times for it to stick in my memory. It doesn't matter how important or interesting that knowledge might be. It requires a lot of work.
Then there are times when I just hear or see something just once, briefly. And then I can't get it out of my head even if I wanted to.
It would be nice to consciously be able to do that: learn things instantly without all the repetition, pondering and hard work. Having such a memory would be fantastic.