Calculating the radius of the Earth
Basil Tikoff, University of Wisconsin-Madison
Science students often have difficulty thinking about large spatial scales. The purpose of the exercise is to redo Eratosthenes' calculation of the radius of the Earth using data from to sites in ancient Egypt. The excercise teaches about the methodology of science - how Eratothenes figured it out - rather than worried about what the "right" answer is. It can also be used to discuss the role of models in geological thinking.

Exploring Earth Systems Science: The Interactive GLOBE Earth System Poster
Amy Ellwein, Western Colorado University

The Use of Cube Puzzle and Toilet Paper Roll Model in Teaching The Nature of Science
Joel Aquino, University of North Georgia / Hall County Schools
This is a hands-on activity in scientific method that uses inexpensive materials such as carton boxes, toilet paper roll tube, strings and toothpicks. It engages the students to conduct pattern observation, prediction, testing and ends up with a model construction. It also encourages thinking outside the box, group discussion and creation of individual cube puzzles.