There’s one other difference. “Where’s Dr. Chow?” I ask. “Who?” Dr. Campbell says. “He did a medical scan on us when we got here before,” Adam says. “I’m sorry, I don’t know who you’re talking about.” Adam and I exchange a wary look. What else might have changed in this future? I check the others’ expressions, but none of them seem fazed by these differences. Then again, they’ve visited this same year multiple times in the last few months. They’re probably used to it constantly shifting in small ways. Dr. Campbell equips us with flexis and neutralizers again, and then we’re taken up to the roof. This time she doesn’t need to explain anything. She gives us each a quick nod and says, “Good luck.” Before I know it, we’ve gotten in another flying car the size of a minivan and are taking

