The Prodigy : A Biography of William James Sidis, the World's Greatest Child Prodigy

Einstein's, the highest ever recorded or estimated. His father, a pioneer in the field of abnormal psychology, believed that he and his wife could create a genius in the cradle. They hung alphabet blocks over the baby's crib--and within six months little Billy was speaking. At three, he was typing and had taught himself Latin. At five, he wrote a treatise on anatomy, and by age six, he spoke at least seven languages fluently. By the time William entered Harvard at eleven, he was also a mathematical prodigy.