This might sound crazy.. but i think that we all have these powers but our minds are never fully developed enough to actually use them. To actually be able to use this ability... you'd probably have...
Simplistically, power is equal to the work done to a system divided to the time taken to do such work. P=W/t. In physics ideas such as power and work do not have the everyday common meanings.
Deja vu is a slight anomaly in your memory, where there's a slight delay where the image doesn't get to your brain as quick as normal. Giving you the feeling that you've seen this before.