Déjà Vu, Again and Again

What's a déjà vu? Turns out it's a bit more complicated than a glitch in the matrix:

"Take a moment to remember what happened during your day yesterday. Images and sounds begin to flash through your mind: people you spoke to, places you went, meals you ate. One scene cues up another, leading you on vivid tangents as you cycle through the day. Now ask yourself: how do you know that you are remembering those images as they happened?"

Full story.
(from Digg)

There's a rare condition called "déjà vécu" which is like having déjà vu all the time. This New York Times article is a long, but very interesting read which gives an insight into the world of the sufferer and the scientists seeking to understand how our memories work.