The camera had proved what Easton did. It could not tell them how to make the next corner. She looked at the uneven steering trace on her laptop, then at the old controller mounted beneath Beacon's clear guard. The damage had changed how the machine responded to a command if she and Camille couldn't account for that difference. The truth they had fought so hard to establish would end in a perfectly honest failure.
Then we used the two hours, Maya said, and pulled up the first calibration graph. At 12:20, the finals hall smelled of machine oil, fresh popcorn, and the faint ozone scent of overworked electronics. The last inspection queue wrapped around two marked tables. Students who had spent months building robots were now studying their machines, like people examining a bridge they were about to cross. Across the room, teams tested their wheels in short bursts, stopped them, and checked the numbers again.
Maya held a ruler against Beacon's front axle while Camille watched the steering trace. The rebuilt machine had one persistent habit. After a sharp left turn, it delayed before returning the right wheel to its normal speed. The new controller was safe, but its timing was not identical to the old boards. Their original code assumed a response the replacement board could no longer give.
We can compensate, Camille said. But if we increase power to catch up, we're going to overheat again. Then we don't increase power. Maya opened the control loop. We change when the command starts.
They use the permitted practice lane, not the official obstacle course, to test a revised steering interval. Camille checked the wheel clearance. Maya compared expected and actual angle changes. Dr. King watched the safe boundary. On the first run, Beacon turned too slowly.
On the second, it overshot. On the third, the little machine completed the lane inside the painted edges. Camille looked at the graph, then ran it once more. The line was not perfectly straight. It was repeatable, and repeatability was what mattered.
That's our setting, she said. Maya saved the program and copied the version number into her notebook. No secret switch, no emergency upgrade from someone else's lab. Just the last adjustment they could defend with a test. At 1:15, the independent inspector checked the battery guard, wiring, emergency stop, and revised documentation.
He measured the heat near the drive controller after a supervised run and compared it to the safe limits provided for the parts. Then he signed their approval sheet. The signature did not erase Tuesday. It meant the machine in front of him was ready to be tested on its merits. Southside's pit had an empty seat where Maya usually kept a spare wheel kit.
Camille put a small folded cloth on it, the rag they'd used to protect the broken sensor mast during the bus trip home. My SR friend touched the cloth once before turning to the course. It was a quiet reminder of how close they had come to having nothing to put on the starting line. Elaine Park stepped to the microphone at 1:45. She welcomed the spectators and explained that every finalist had undergone the same technical inspection.
Then she addressed the incident that had filled the school rumor feeds for days. The review panel, she said, had examined original recordings and records, found that Southside's stationary robot had been deliberately damaged by another participant, and determined that Southside's alleged unsafe operation had not been supported. The center had corrected its records and reinstated the team's competition eligibility. any separate student discipline process would be handled privately and fairly. She did not play the most painful footage to the entire hall.
She did not name Lucas or ask him to stand. The truth was public where it needed to be while the evidence remained available to the proper process. A few students gasped. Others glanced toward North Point's table. Easton stood behind his team's chairs without the captain's badge he'd worn in practice.
His school had appointed another student to lead the final run pending its review of his conduct. Park had permitted the rest of North Point's team to compete. They had spent months designing their own machine and hadn't been found responsible for what he had done. Easton looked across the room. For a second, his gaze met Maya's.
She saw fear in his face and resentment and the dawning knowledge that a polished explanation could not reverse a recorded choice. She did not nod or smile. She turned back to the table where her own team stood. D. The competition began with a brief design presentation. Each team had to explain the problem it was trying to solve and why its approach would matter outside the science center.
North Point's rover looked impressive, and its new captain spoke clearly about obstacle mapping. Another team from West Creek showed a tiny agricultural sorder. A third had built a movable medical supply shelf for use in school drills. The projects were not cartoon villains lined up to lose to Southside. They were work by young people who cared about difficult things.
The other teams also treated Southside differently than Maya had expected. One of the West Creek students asked whether Beacon's damaged frame had forced a change to its center of gravity. Maya answered yes and showed the correction in their maintenance log. A North Point student who was not Easton quietly offered a spare cable tie. When Camille realized their supply bag had run out, Camille accepted it, wrote the down out the borrowed piece, and promised to return an unopened replacement.
The small exchange reminded Maya that Easton's choices did not define every person wearing North Point's colors. It would have been easier and much less fair to make the whole team answer for him. Instead, their contest could return to the ordinary challenges of wheels, code, judgment, and nervous hands. When Maya stepped forward, the audience quieted. She could feel the expectations after Park's announcement.
Some people wanted a speech about injustice. Others wanted a dramatic response. She gave them a design description instead. Beacon is a lowcost inspection rover for small drainage passages. She said it doesn't clean a pipe and it doesn't replace a trained crew.
It helps a crew see what's ahead before someone has to reach into a difficult space. We focused on inexpensive components, documented maintenance and sensing that can handle reflective walls. Camille took the microphone. We also learned that repairability is only real if your replacement parts have documented electrical behavior. This week, we changed a motor controller and had to rewrite part of the timing system.
We'd rather report that honestly than pretend the same code works on everything. An engineer in the judge's row leaned forward. What did the replacement change about performance? It adds up measurable delay after sharp turns, Camille said. We tested it this morning and compensated in the command schedule, not by pushing the motor harder.
The judge asked for their for their data. Maya showed the recorded headset test with the failed runs included. The people in the first rows seemed surprised that the girls had not hidden the messy part of their process. Dr. King, watching from the side, smiled briefly. At 2:20, Beacon was placed behind the course's starting line.
Ahead stretched the mock drain, a narrow straight section, a turn bordered by blue reflective panels, a low obstacle, and a final inspection window that required the camera to center on a hidden marker. Teams scored points for accurate mapping, safe passage, and reliable reporting. Finishing quickly helped, but crashing into a wall cost more than moving carefully. Maya watched the countdown and tried not to think of the sound Becken had made hitting the floor. The whole week had taught her to hear broken things. "Now she needed to listen for things that worked." "Ready?"Camille whispered. "No,"Maya said. Camille smiled. "Same."The signal sounded.