What makes the lub sound of our heartbeat?

What does the name marcy mean? What is the counter part of menstruation for men? What can i do to prevent the spread of polio? What is good or healthy cholesteral? What people wait for in life? How do you get rid of swelling above knee? What was the first Harry Potter called before the name was changed? Why is tar poisonous? Are fake sunglasses harmful? How have you been doing? How tall is Mac dre? How long do baked beans last once opened? How often do families buy individual health insurance for themselves? Why does he never answer but calls you back? Im 13 and only weigh 69lbs and my twin weighs even less but i cant gain weight no matter how much i eat HELP no im not anorexic? Interested in a guy of another race How do I approach him? Why must people have gold teeth? Why would a person that you care for and you thought they cared for you just turn their back on you and not talk to you anymore? What are the eight dimensions of wellness? The mother of your husband or wife?