The Leaning Tower of Pisa, Italy. Shallow foundations in unstable subsoil were laid in 1173, and so the tower began to sink when the second floor was added in 1178. Floors above were built taller on one side to try and compensate for the tilt, producing a mildly curved tower. Original image courtesy Saffron Blaze, via http://www.mackenzie.co, via Wikimedia Commons.
Sometimes our students are surprised by the amount of attention we ask them to lavish on their feet. If they came in for help with a problem in their backs, knees, or hips, working with the feet can seem a little strange or irrelevant. But over decades of teaching, I see the importance of working... Read more