Every week, Dr. 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.

This week Dr. Kaku addresses the question of the possibility of a "von Neumann probe," which is essentially a virus, a self-replicating probe that can then explore the universe near the speed of light. 

Watch the video here:

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