• Our brains were built for walking--12 miles a day!
• To improve your thinking skills, move.
• Exercise gets blood to your brain, bringing it glucose for energy and oxygen to soak up the toxic electrons that are left over. It stimulates the protein that keeps neurons connecting.
• Aerobic exercise just twice a week halves your risk of general dementia. It cuts our risk of Alzheimer's by 60 percent.

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• Your body's defense system--the release of adrenaline and cortisol--is built for an immediate response to a serious but passing danger, such as a saber-toothed tiger. Chronic stress, such as hostility at home, dangerously deregulates a system built only to deal with short-term responses.
• Under chronic stress, adrenaline creates scars in your blood vessels that can cause a heart attack or stroke, and cortisol damages the cells of the hippocammpus, crippling your ability to learn and remember.
• Individually, the worst kind of stress is the feeling that you have no control over the problem--your are helpless.
• Emotioanl stress has huge impacts across society, on children's ability to learn in school and on employees' productivity at work.

• We don't have one brain in our heads; we have three. We started with a "lizard brain" to keep us breathing, then added a brain like a cat's, and then topped those with the thin layer of Jell-O known as the cortex--the third, and powerful, "human" brain.
• We took over the Earth by adapting to change itself, after we were forced from the trees to the savannah when climate swings disrupted our food supply.
• Going from four legs to two to walk on the savannah freed up energy to develop a complex brain.
• Symbolic reasoning is a uniquely human talent. It may have arisen from our need to understand one another's intensions and motivations, allowing us to coordinate within a group.