Zivia opens her mouth, pauses, frowns without closing her mouth, tilts her head slightly, and gradually takes on an expression of delighted perplexity. (Icons cannot hope to capture the scope of this face journey.)

"Do you know," she says, marveling, "I'm actually not sure? What a great question. Let me think."

And she pops a sliver of grilled zucchini into her mouth and chews, considering.