Reviews The Fifth Postulate: How Unraveling a Two-Thousand-Year-Old Mystery Unraveled the Universe by Jason Socrates Bardi Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Science News April 23, 2009 at 4:05 pm The story of the discovery of non-Euclidean geometry.Wiley, 2009, 253 p., $27.95. THE FIFTH POSTULATE: HOW UNRAVELING A TWO-THOUSAND-YEAR-OLD MYSTERY UNRAVELED THE UNIVERSE BY JASON SOCRATES BARDI