This evening, I spoke with my grandson, Zachary Heyman. He has just returned from Asia, where he traveled with a group that brings American kids to places they haven't been before.  The kids then help out with various projects that require both smarts and physical capabilities. The part Zach loved on this trip was teaching preschool kids the color words in English.      I especially loved hearing that, since I was a teacher for almost 40 years. I told Zachy that he comes from a long line of public school teachers: my mom, two of my sisters, my brother, and several aunts, uncles, and cousins.