Every Wednesday, Michio Kaku will be answering reader questions about physics and futuristic science. If you have a question for Dr. Kaku, just post it in the comments section below and check back on Wednesdays to see if he answers it.

Today, Dr. Kaku addresses a question posed by Ivailo Krastev: Could the experience of déjà vu be related to parallel universes? Why does it happen at all? Is there some possible explanation offered by the laws of physics?