Since déjà vu occurs in individuals with and without a medical condition, there is much speculation as to how and why this phenomenon happens.
There are more than 40 theories as to what déjà vu is and what causes it, and they range from reincarnation to memory glitches. Let's explore a few of those theories to shed some light on this perplexing phenomenon.
Full list at HowStuffWorks.com.
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