Guest:  Dr. Matthew Weinzierl: Topics:  We discussed commercial space economics, Matt's Harvard classes relating to commercial space and economics plus his students, student interest in space, space as a long term play vs. short term economic news.

Guest: Dr. John Brandenburg;  Topics:  Dr. Brandenburg's new sci-fi book, The War Of The Singularity: The Human Race is Cancelled… and updates for his theory regarding nuclear bombs having destroyed Mars about 180 million years ago due to traces of Xe 129 in the Martian atmosphere.

Guest:  Karlton Johnson (Ret, USAF) & Chairman of the NSS Board of Governors; Topics:  NSS, leadership, the space value proposition, space and our future, national security space, the meaning of the "high ground, space settlement, Ad Astra and much more.

Guest:  Dr. Erik Seedhouse;  Topics:  Dr. Seedhouse discussed is life support book, :Life Support Systems for Humans in Space along with his science fiction novel, "Terminal Reality." Human medical factors were also topics for discussion as was propulsion.

Guest:  Dr. David Livingston;  Topics:  Multiple topics discussed today with callers and from email questions.