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 Anna Warren: How long will it be before we can have our own Holodeck like on Star Trek? I would like to have one in my apartment.