Everything, Maruki. Were any natural law, any rule of matter or energy, the slightest bit different, then we'd have no guarantee to exist. Instead, every fundamental aspect of reality operates in harmony to make our presence here inevitable.

I realized that, sitting there, staring down at my final proof. And in that moment, all my preconceptions and notions of possibility were swept away. [Her eyes are distant again, her gaze up in the leaves above but seeing little of them once more.] And I felt some powerful existence, fate perhaps, had us in its gentle embrace. Infinite, yet intimate. Intimidating, yet reassuring as well.

And in the next moment, I realized how very fragile all creation is. How that slightest difference would have dispelled it all, how absolutely improbable every sight and every sound and every moment of time was.