@Mor - Actually that's related to the way that memory works in general. It's kind of like a big filing system. Some scientists think that everything is filed away, but a lot of it is never seen again because it isn't put in the existing system. Others think that if it isn't filed properly in the first place it isn't remembered at all.
At any rate, in terms of practice, it means that you are much more likely to remember something if you can connect it to something you already know. That might be something abstract and not really related, or it might be two facts that are absolutely related.
So, for example, it's much easier to remember a fact about Oscar Wilde if you first know he exists and don't just find out both those things at the same time. That way new facts about him can be filed in the right place and you will know where to access them.