Guest: Dr. Dennis Bushnell, Chief Scientist at NASA Langley Research Center, was the guest for today's program. We began our discussion talking about the advancements in revolutionary technology needed for a manned mission to Mars. Dr. Bushnell has a published paper on this subject, titled "Advanced-to-Revolutionary Technology Options for Humans-Mars," which I will send as a Word document if you email me and request it. Based on this paper and the first part of our discussion, Dr.