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.
In baseball, a balk is called by an umpire. Balk rules protect runners from being deceived by the pitcher. If the ball is thrown before the batter gets settled in the batter's box, the umpire will call a balk. If a pitcher begins his delivery motion but then stops, he'll be called for a balk.
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.