December 1941 was a turning point, and with it came America’s first air hero - Captain Colin Kelly. Flying a B-17 into hostile skies, he led a bombing raid that would cost him his life. His courage in ...

In this video we will explore torsion, which is the twisting of an object caused by a moment. It is a type of deformation. A moment which tends to cause twisting is called torque. Some of the things ...