" mother instilled in me a deep respect for the potential of the human brain, and that respect has deepened over the years to an attitude I can only describe as awe. Every time I open a child’s head and see a brain, I marvel at the mystery: This is what makes every one of us who we are. This is what holds all our memories, all our thoughts, all our dreams. This is what makes us different from each other in millions of ways. And yet if I could expose my brain and your brain and place them side by side, you wouldn’t be able to tell the difference—even though we might be very different people. That still amazes me. Inside each human brain are billions and billions of complex interconnections, neurons and synapses, which science has only barely begun to understand. When you add to that the mystery of mind "

― Ben Carson , Take the Risk: Learning to Identify, Choose, and Live with Acceptable Risk