Ever had that eerie feeling you’ve lived a moment before—like reality is on a strange loop? That’s déjà vu, French for “already seen.” And it’s not just a quirky brain glitch; it’s actually a fascinating clash between a false sense of familiarity and what you know to be true. Surprisingly common, as studies show about two-thirds of people have experienced it at least once, scientists have been trying to crack its mystery for years, and for good reason.
Click through the following gallery to dive into the latest research on déjà vu.