The night before the flight, Lena Ortiz lined up three things on the desk beside her bed: a battery pack, a notebook swollen with folded diagrams, and the orange-patched backpack she had carried to every robotics meeting since seventh grade. She arranged them in a row, edges aligned, the way she arranged tools before a build. Order first. Then work.
The notebook deserved its own ritual, because it was not a school notebook. It was a working notebook, swollen with folded diagrams because Lena never threw a version away; she folded the old one back and drew the new one beside it, so the history of an idea stayed visible next to the idea itself. The earliest diagram in it was from Tidepool's first month: a pipe robot drawn as a rectangle with wheels, labeled in handwriting that leaned hard to the right, with an arrow pointing at a sensor and a note that read, in capitals, DOES IT KNOW WHERE IT IS? That question had stayed with the team for two years, and it had followed Lena onto the airplane, though she did not know it yet. The battery pack was the second item because Lena's migraines had taught her, early, to prepare for the possibility that a plan would take longer than scheduled; a dead tablet on a delayed flight was a small disaster she could prevent, and prevention, for Lena, was a form of self-respect. The orange-patched backpack was the third because it had a pocket for everything — the tablet, the water bottle, the folded paper with the seat number written on it in Marisol's handwriting — and because its orange patch, sewn on after a strap tore at a robotics meet in eighth grade, made it findable in any overhead bin or pile of identical bags. She lined the three things up in the same order every time she traveled, not from superstition but from a principle Mateo had taught her without ever stating it as one: that checking is easier when the things to be checked are visible, in a row, where your eyes can travel across them like a checklist. That night, she checked them twice. The second check was not anxiety. It was practice. And practice, as the next day would prove, is what you reach for when the room stops cooperating: not courage, exactly, but the habit of having already decided, in advance, what you will look at first.
The robot itself was already in Seattle with the rest of the Tidepool team. It had traveled in a padded crate, surrounded by foam and labeled with Priya's careful handwriting: THIS SIDE UP. Lena had supervised the packing herself, checking each latch twice. Letting it go had felt like sending a child to camp.
She checked the shared drive one more time. Not because the files were missing — she knew they weren't — but because checking was what she did when a moment mattered. A good system, Coach Patel always said, should be able to survive one person's mistake. She had written that on the inside of her notebook in black marker, in letters large enough to read without her glasses: A good system should survive one person's mistake.
Her mother stood in the doorway with a mug of tea. Ana had only recently started walking around the house without looking exhausted — the surgery had taken more out of her than she'd admitted, and the recovery had been slower than the doctors promised. Lena had become skilled at pretending not to notice how carefully her mother lowered herself into a chair, the way you pretend not to notice someone's limp so they don't have to explain it.
"You know you can be excited," Ana said. "You don't have to act like this is a laboratory inspection."
Lena looked up from the desk. "A competition is an inspection of sorts. They inspect the robot. They inspect us."
"They inspect the work," Ana corrected gently. "There's a difference."
Her mother smiled, then asked whether the airline had confirmed the arrangements. Lena showed her the email on her phone. It listed the flight, the companion traveler, and a seat number — 2A — but it didn't explain why the seat mattered. It didn't mention the accommodation note, or the vestibular migraines, or the way a hallway could tilt without warning. Lena was grateful for that privacy. She could talk about sensors before a room of judges without blinking, yet discussing the invisible disorder that sometimes made the world slide sideways left her strangely speechless.
Some things were easier to engineer than to explain.
Mateo called after dinner. Her grandfather's voice came through the phone warm and a little crackly, the way it always did from his workshop.