After the death of his 96-year-old father, a World War II veteran, Robert Schoen set off on a coast-to-coast journey. On a beautiful Southern California day in April 2017, 70-year-old Schoen waded knee-deep into the Pacific. He then walked back to shore, put on his shoes and socks, and began walking toward the Atlantic. Although he'd never walked more than seven miles in a row and was anything but an outdoors fanatic, he did possess certain qualities...