The look on Christina's face is priceless. Monkey boy knows no fear. He has even taken to scaling the jungle gym at the playground down the street from the house. He'll find some fear and caution after that first good but minor tumble. At least that is...

Throughout 99% of human history, the average life expectancy was less than 18 years. That’s changing. According to the U.S. Census Bureau, there are now 80,000 centenarians in the United States, and that number is projected to increase seven-fold, to...