High schoolers engage in a historical review, starting with the existence of the horizon at sea, proceeding to various studies of the Earth's size and shape, and leading to the attempt by Columbus to reach India by sailing westward.

Students round out their math skills with these ‘round the world' ideas. In this math and geography lesson, students try out time zone sticks, a polar race, and tic-tac-globe to engage them in learning more about globes and the...

Third graders discuss how Aristotle concluded that the Earth was round. As a class, they review theories about the Earth's shape and describe how life on Earth would be different if it were flat. Individually, they make a moon book in...