Cervical cancer is caused by severe abnormal changes in the cells of the cervix. Most precancerous or cancerous cell changes occur in the cervix at the transformation zone, because these cells normally undergo constant change.
A balk in baseball is any action by the pitcher that violates the balk rule, which restricts the actions of the pitcher when there is at least one runner on base. The purpose of the balk rule is to protect the runner or runners from being deceived by the pitcher.
What is Knuckleball? This is a type of pitch in baseball characterized by its unpredictable flight path. The pitch is also known as a knuckler and involves a special grip. A common misconception of the knuckleball pitch is that it's thrown with knuckles on the ball. The most common grip involves 'digging' the index/middle/ring finger nails just below the seam of the baseball, leaving your pinkie finger loose, and thumb under the ball.