Do you know that only 15% humans have their wrist bone poped like this. The presence of this bone means that these humans belong to specific type of their ancestors. Knowing more about our ancestors can actually help us take better care of our bodies. Some of our bodily features are related to the animals we are descendants of. Here is a test by which you can check that from which ancestors you belong.
Place your arm on a flat surface. Bring your thumb and pinky finger close and tip your hand slightly up.