52: Walking speed is proportional to pressure placed on the toe, and thus can be observed through a footprint. A slow gait will have a greater indentation at the back, a fast one at the front. A runner's footprint won't have any heel print at all.
37: If someone is lying to you they will look straight into your eyes, while people telling the truth tend to be more casual or at ease. The perception that most people lying look to the left is false.