“In the prime of life, the cerebral cortex contains 25 billion neurons linked through 164 trillion synapses. Thoughts thread through 7.4 million miles of dendrite fibers and 62,000 miles of axons so compacted that the entire neural network is no larger than a coconut. No two brains are identical, nor are two minds ever the same. Wherever researcher Sandra Witelson looked, she discerned subtle patterns that only gender seemed to explain. Her findings buttress the proposition that basic mental differences between men and women stem in part from physical differences in the brain.”