When you think about Einstein and physics, E=mc^2 is probably the first thing that comes to mind. But one of his greatest contributions to the field actually came in the form of an odd philosophical footnote in a 1935 paper he co-wrote -- which ended up being wrong. Chad Orzel details Einstein's "EPR" paper and its insights on the strange phenomena of entangled states.

Review of the basic differences between vectors and scalars. Uploaded by BrooklinePhysics