Calvin and Hobbes is a syndicated daily comic strip written and illustrated by American cartoonist Bill Watterson, and first syndicated from November 18, 1985 to December 31, 1995. It follows the humorous antics of Calvin, an imaginative and adventurous six-year-old boy, and Hobbes, his energetic and sardonic stuffed tiger. The pair are named after John Calvin, a 16th-century French Reformation theologian, and Thomas Hobbes, a 17th-century English political philosopher. At its height, Calvin and Hobbes was featured in over 2,400 newspapers worldwide; as of January 2010, reruns of the strip still appear in more than 50 countries (though not in North America). Nearly 45 million copies of the 18 Calvin and Hobbes books have been sold.