What does principal over collision mean in a rebus puzzle?

Why does your body itch when you jog? Phobias that start with t? What is Treatment for low albumin? Can you have the flu without upper respiratory symptoms? Most eating disorders began at age? Was the yellow fever real? What are the chances that a miscarriage was not found at the 12-week checkup? Does shoulder protraction stretch the infraspinatus and supraspinatus muscles? Who can help you with fund to be put on lung transplant list? Can there be a loss of mental function in the late stages of AIDS because HIV also destroys nerve cells? Where does the urea enter the blood? How important is your skin for the functioning of the nervous system? How does a relationship change after they have a baby together? What is the icd 9 code for nonverbal learning disorder? You think you crank your rib cage? Why do you have to get a prostate exam? Camel life cycle? What does pathogens and microbes have in common? If your cervix is open 1 cm what does that mean? How did john Dalton get eye disease?