Das Feet! If you have ever had the occassion to examine severly blistered of burned feet, you may see like I have that the feet are different. The bases are multilayered and have evolved to do many things. An Endorphine pump too? You bet! That fits in with my theory that the feet are like batteries and inverters and can actually store and transform energy! I believe they can actually transform heat energy into electrical energy. This latter function is what helps to maintain them during severe hard use and trauma. I believe we are far more amazing than has yet been discovered or appreciated for the most part.