But to be a parent is to live in the past-present-future all at once. It is to hug your children and be intensely aware of how much smaller they felt last year ... even as you wonder how much bigger they will feel the next. It is to be a time-shifter, to marvel at the budding of their intellect, their verbal dexterity, their sense of humor ... at the same time rewinding and fast-forwarding ... to when they were younger, to when they'll be older. It is to experience longing for the here and now, which I know sounds flaky - sort of like complaining about being homesick when you're already home - but can happen, trust me, when you live in multiple time zones all at once.