His parents thought his head looked physically unusual from the start,they wondered if he was deformed,but doctors told them time would make it right.
In his infant cortex,glial cells spun fatty white sheaths of myelin to insulate them like electric wires. The sheaths speed impulses 10 to 100 times faster that they can travel on a naked axon,and those allowing him to see,hear,touch and move probably myelinated first,smoothing the baby's jerky motions.
His parents worried about his brain even after he had learned to walk,because Albert did not jabber new words as other toddlers did. He often repeated himself under his breath after he spoke. So later scientists would wonder whether neural networks devoted to language had already ceded cortical ground to some other cognitive function. Einstein told biographers that he had simply put off talking until he could speak in complete sentences.
At the age of 5,his brain puzzled at the compass his father gave him,transfixed by the inevitable force that kept its needle pointed north. That same year,he tossed a chair at his violin teacher,but with practice the malleable young cortex obliged,so that withing a decade he played Mozart on the violin.
The childhood brain forged millions more connections than it could ever use. Each waited to be stimulated,directed to a certain task,to grip a pencil,plunk a piano,laugh. Neurons competed with each other for thinking jobs,and the losers perished in another round of ruthless pruning.
Some schoolteachers thought Eintsein dull-witted and moody,said he would never amount to anything because he responded to them with open disrespect for their authority. Yet Einstein had no difficulty concentrating when he chose to.His younger sister,Maja,always remembered how he buit a house of cards 14 storeys high. The poor medical students his father hosted for lunch on Thursdays would fascinate him too,introducing the young Einstein to books about science,astronomy and philosophy. His Uncle Jakob presented algebra to him as a ''merry science in which we go hunting for a little animal whose name we do not know'',and in these matters Einstein flourished,his young brain soaking the language of mathematics,bending neurons to its logic. At 12 he fell in love with Euclid,caling the text his uncle gave him his ''holy geometry book''. At 13 he began to study higher mathematics on his own,surpassing the knowledge of his own instructors. In the midst of family parties,he squeezed onto the sofa,balanced an inkpod on the armrest,and worked fevereshly on equations,oblivious to everyone around him. At 16,Einstein wrote his uncle a letter proposing an experiment to see if electricity,magnetism and ether were connected. Already,synapses fired toward an extraordinary future.