When’s the last time you rode a roller coaster? For me, it was four summers ago. The kids and I spent the day at Six Flags pushing the limits of gravity and our ability not to vomit. They came home hyper and happy, ready for another visit. I came home queasy and sad that my stomach no longer belonged to a twelve-year-old. The cool thing about a roller coaster is its ups and downs and twists and turns. Climbing to the big drops spikes adrenaline and builds anticipation. The bad thing about a roller coaster is its ups and downs and twists and turns. Just when I’m flying high, my…