I watched as Tiller took off full-throttle downhill to the bus stop. Then something caught her eye in the neighbor’s yard, so she darted over to it. She bent over. Picked something up. Stood up, holding a stem with dandelion seeds at the end, then blew them as hard as she could. Watched them fall to the grass, dropped the stem, and then turned around and ran, full-throttle once again, down to meet her brother.