Reform Judaism in the 19th century rejected the Orthodox observance of the Sabbath as a 24-hour day of rest, but the demands of living in the 21st century are compelling reasons to once more embrace the Sabbath, a leading Reform rabbi said Saturday. The message came as nearly 6,000 Jews, wearing yarmulkes and bluejeans, prayer shawls and Ugg boots, gathered for a five-day convention of the Union for Reform Judaism. The Jewish denomination, which claims the most adherents of any in the United States today, is characterized by a belief that each generation seeks to bring contemporary expression to the...