A pyramid is an incredibly strong, stable shape, and has been used for thousands of years. All pyramids have edges, vertices (corners), an apex, triangular faces and a base, which varies in shape depending on the number of sides. The Investigators look for triangular shapes that support things and are used in structures. A wide base makes a pyramid strong, as ancient Egyptian and Mayan architects knew. A mathematician demonstrates how force is distributed in triangular and pyramid shapes.