Could an Irish monk in the sixth century really have sailed all the way across the Atlantic in a small open boat, thus beating Columbus to the New World by almost a thousand years? Relying on the medieval text of St. Brendan, award-winning adventure writer Tim Severin painstakingly researched and built a boat identical to the leather curragh that carried Brendan on his epic voyage. He found a centuries-old, family-run tannery to prepare the ox hides in the medieval way; he undertook an exhaustive search for skilled harness makers (the only people who would know how to stitch the...