I sit, tense, breathless, eyes glued to the screen. I am thirteen years old. It is cold outside, the kind of cold that stings the tip of your nose and bites deep in your lungs when you inhale. It is almost time. We’ve been waiting all morning. I’ve been looking forward to this for weeks, obsessively following the news for mention of launch preparations, reading Christa McAuliffe’s simple biography in The Inquirer: an ordinary history teacher, just imagine!  I’ve been lying awake at night, thinking about the infinite nature of space until infinity blew my mind and I couldn’t grasp…