Pictures from Professor Stein's talk:

[1] Map of Italy

[2] Balance

[3] Center of Gravity

[4] Properties of the Center of Gravity 1

[5] Properties of the Center of Gravity 2

[6] Conic Sections

[7] Parabola and its Focus

[8] Properties of Parabora

[9] Area of a Paraboran 1

[10] Area of a Paraboran 2

[11] Paraboloid

[12] Center of Gravity of a Paraboloid

[13] Floating Paraboloid 1

[13b] Floating Paraboloid 2

[14] Calculating Pi

[15] The Tomb Stone of Archimedes