For Michelet, the Renaissance was more a development in science than in art and culture. He asserted that it spanned the period from Columbus to Copernicus to Galileo; that is, from the end of the 15th century to the middle of the 17th century.
Other researchers believe that side stitches are caused by stretching the ligaments that extend from the diaphragm to the liver. When a runner or walker pounds the surface while breathing in and out, he or she stretches these ligaments, and that causes the pain.
For most of us, our jangly jowls and hanging cheeks are a source of chagrin as we age. Running causes your face to sag. FALSE. Sagging skin is due to two age-related reasons: loss of collagen, which gives skin its elasticity, and loss of facial fat, the absence of which causes skin to droop.