“The world goes away,” she had once told Kamran. “A new world replaces it. When you dive, there is only the here and the now: no past, no future. You don’t think about plans for the next experiment, about grants and laboratory equipment purchases. You think about the world in front of your mask. There are so many times in life when you just aren’t there. When you are elsewhere, drifting through schemes for this or that, remembering slights and injuries, shortcomings and faults. But not when diving. Down there, there is only now.”