I woke up at 5:30 AM after a string of nightmares about being left alone on a dusty red planet. Like a fool I'd eaten a gigantic piece of chocolate cake the night before while watching a set of tiny teaser clips of "The Martian" to mentally prepare for the next day, which was then, now, today. "It's OK," I told myself. "Stay calm. You're in Houston. You're on East NASA Parkway in the same hotel you'd checked in to the day before. Today you're going to go on a brief ride in a Mars rover and talk to an astronaut."