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 comment section below and check back on Wednesdays to see if he answers it.

Today, Dr. Kaku addresses a question posed by David Hernandez: If subatomic particles can be in two or more places at once, could parts of us be travelling back and forth between parallel universes and could these particles be dark matter?