Is it all just an illusion? Greg Foot explains the history of déjà vu. Footnote 1 - Footnote 2 .\r<br>\r<br>Déjà vu, that strange sensation when youve seen something before. But what causes it? The Factomania team explain how our brains memory works and how .\r<br>\r<br>Scanning the brains of people experiencing déjà vu suggests that the phenomenon is a sign of a healthy brain that forms accurate memories.\r<br>\r<br>\r<br>\r<br>Do you know where all of your data is? If you tried to delete it would it really vanish? Greg Foot sets out to get some data on whether or not anything is ever really .
