Teacher's Delight

Chapter Thirteen Zarina

She did not go home after class. She went to the library, claimed the corner table by the window that had become hers by some unspoken cohort consensus, and opened the Amara Grid deployment model with the specific, focused violence of someone who needed her hands busy before her mind found something less productive to do with the afternoon.

She was not going to think about the two cold-calls. She was especially not going to think about the particular flatness in his voice when he'd said let's move on, the way it had landed like a door closing on a room she hadn't fully realized she'd let herself stand in. She had work. The work did not care what had or hadn't happened in an office two days ago, and there was a mercy in that, in numbers that behaved the same way regardless of who was or wasn't speaking to her with warmth.

She pulled up the storage subsystem section first, because it was the part of the model she trusted most completely, the part built on eighteen months of actual failure rather than projection. The first housing prototype had cracked under thermal cycling within six weeks. The second had held longer but bled charge overnight at a rate that made the whole promise of multi-day storage functionally meaningless. It was the third redesign — her lead engineer's idea, not hers, she was always careful to credit it correctly when she presented the model, because taking credit for someone else's insight felt like exactly the kind of small dishonesty that eventually cost you people like Chinedu — that had finally solved it: a phase-change thermal buffer wrapped around the transformer housing, cheap, unglamorous, built from materials sourced locally rather than imported, that slowed the charge bleed enough to make four cloudy days survivable instead of catastrophic.

She built the visual for it now, translating eighteen months of scorched and rebuilt prototypes into a clean diagram a review panel could absorb in ninety seconds, and felt something settle in her chest that had nothing to do with a classroom three buildings away.

This was the part of herself she trusted without reservation. Not the part that stood in a professor's office asking questions she hadn't fully thought through the consequences of, not the part that had cried in the shower her first week in this country and still, four months later, did the math on flight costs more often than she'd admit to anyone but Sugar. The part that looked at a broken thing and made it work. She had never once doubted that part of herself, and working inside it now felt like coming up for air.

Margaret found her there two hours later, dropping into the chair across from her with a coffee she hadn't asked for and set down anyway, a habit that had stopped needing explanation weeks ago.

"You're doing the thing," Margaret said.

"What thing."

"The thing where something upsetting happens and instead of talking about it, you build an eleven-page financial model at a speed that should probably concern someone." Margaret peered at the screen, genuinely curious rather than only checking on her friend's emotional state. "Is that the storage diagram? That's — okay, that's actually beautiful, in a deeply nerdy way. Explain the buffer thing to me like I'm someone who took exactly one required stats class and resented every minute of it."

Zarina explained it — the thermal cycling failures, the phase-change material, the specific stubbornness of a rainy season that had once seemed like the whole project's fatal flaw and was now, four redesigns later, the very thing that made the model defensible at scale — and found, halfway through the explanation, that she'd stopped thinking about the classroom entirely. There was something almost meditative in narrating a problem she'd already solved, the relief of certainty after a day that had offered her none.

"You built this," Margaret said when she finished, something quieter than her usual teasing in her voice. "Actually built it. Not theorized it, not modeled it on a spreadsheet from a case study — you and actual engineers, actual villages, actual water coming out of actual boreholes because you refused to let a battery housing c***k four times and call it unsolvable."

"It felt unsolvable the third time."

"But you didn't stop."

"I didn't have the luxury of stopping. There were people already depending on the first pilot site by the time the second one started failing." Zarina said it plainly, without performance, because it was simply true, and true things had a way of sounding more dramatic than she intended when said out loud to someone who hadn't lived them. "Failure wasn't really available as an option. Not in the way it might be for a class project."

Margaret was quiet a moment, turning that over. "Is that why the McIntyre thing is eating you alive? Not because you're — I don't know, love-struck, though you clearly are a little, don't argue with me about that part — but because for once in your life, something's not actually solvable by working hard enough at it?"

Zarina looked at the diagram on her screen, the clean, hard-won proof of a problem she'd refused to accept as unsolvable, and felt the observation land somewhere true enough that she didn't have an immediate rebuttal for it.

"Maybe," she admitted, finally. "I don't know how to want something I can't just — build my way toward. It's not a spreadsheet. There's no redesign that fixes it if the fundamental materials won't hold."

"Some things aren't spreadsheets," Margaret agreed, gently, for her. "Doesn't mean they're not worth the eighteen months, though. Look how the storage thing turned out."

Zarina didn't answer that directly. But she saved the file, and closed the diagram, and let herself sit a moment longer in the quiet of the library with a friend who'd shown up with an unasked-for coffee and stayed long enough to say something true, and thought, for the first time in two difficult days, that perhaps not every hard thing needed solving today. Some things, like phase-change buffers and homesickness and whatever had cracked open in an office on Wednesday and closed just as fast on Friday, simply needed time, and patience, and the stubborn refusal to call them unsolvable before she'd actually tried every version of the redesign.