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.
Running Doc addresses a common problem among runners who donât wear appropriate clothing: chafing that causes bleeding and irritation. The problem can be solved by wearing softer, looser shirts made of soft , sweat-wicking fabric. After this weekend's Manhattan Half Marathon my nipples bled, I'm in pain still, and my favorite T-shirt needs cleaning.