Lady's slipper walk, 1-2:30 p.m., Jay Cooke State Park. Meet in front of the River Inn Visitor Center and go on a 2-mile guided hike to the hillside of yellow lady's slipper flowers. Free, state park ...

Later, as books about chess began to be published especially after Gutenberg created his revolutionary printing press in c.1440, the game began to assume a more general form during the 16th century.