Brain Candy for expectant parents Pregnancy is an adventure. Lots of books tell you the basics--"the baby is the size of insert fruit here]." But pregnant science writer Jena Pincott began to wonder just how a baby might tinker with her body--and vice versa--and chased down answers to the questions she wouldn't ask her doctor, such as: - Does stress sharpen your baby's mind--or dull it? - Can you predict your baby's temperament?...