Why not remember easily?

It is logical to happen. Our brains can process a small number of information simultaneously, and when we want a quick solution, come running out of time, trying to give us the best result, in this moment ours memory locks too much effort.
If we wait a little bit, without stress, we will get the answer that we are expected, but if we focus even more, there is no chance to succeed.
or probably you are an Einstein
foto via