One of the important keys to all these memory tricks is repetition. When we first collect a new piece of information, it goes straight into our short-term memories. This can only take 8 seconds. The trouble is, the short-term memory is a holding area for new information and unless we move stuff out, it will quickly be replaced with newer information. Moving information out means moving it into our long-term memories where it can remain indefinitely. The problem here is, it can take anything up to 6 hours to get something firmly embedded. And that’s where repetition, review, and replay come to the rescue.