CHAPTER ELEVEN — A SMALLER POOL
Saturday morning began with a call from the principal.
She had arranged the gym, borrowed folding tables, and found two science teachers willing to supervise a demonstration.
The school district’s insurance coordinator had approved use of the shallow tank if the robots stayed within strict electrical and battery safety rules.
They would use inspected low-voltage equipment, keep spectators back, and stop immediately if anything malfunctioned.
The news photographer would still come, but she had agreed not to photograph children without parental permission.
Ethan brought the empty test tank from storage with help from Mateo’s father.
They carried it into the gym and filled it under the custodian’s watchful eye.
The children built their course from plastic hoops, weighted markers, and two floating targets.
Priya spent most of the morning rebuilding her robot’s guard from a spare part.
Mateo rewired a damaged controller.
Sam calibrated his buoyancy system and discovered that it rose too quickly whenever he released the controls.
Nell tried three different steering settings before she found one that felt natural.
There were arguments about lane width, stopwatch rules, and whether a machine that touched the wall should restart.
Nobody invoked an investor’s authority to settle them.
The students voted on the rules after Ms. Rios made sure everyone understood the options.
Ethan watched the process with quiet satisfaction.
It was less polished than the promotional contest Oliver had planned.
It also seemed more honest.
Carol arrived carrying two large cartons of sandwiches.
She stood at the entrance until Nell noticed her.
“I brought lunch,” Carol said.
Nell hesitated, then waved her inside.
Ethan helped Carol set out the food.
“The pool company sent me the estimate,” he said.
Carol winced.
“How bad?”
“Expensive enough that I wish you’d thrown a sponge instead.”
She covered her face for a second.
“I’ll pay it.”
“We’ll work out a schedule.”
“You’re being kinder than I deserve.”
“I’m being practical,” Ethan replied.
“I still need a functional pool when this is over.”
Carol laughed, and the sound surprised both of them.
At noon, the first families arrived.
Several children from other schools had been disappointed when Blue Current canceled the official competition.
Ethan invited them to present their projects anyway.
A team from the next county displayed a robot designed to collect floating trash.
Another showed a small underwater camera housing made from reused materials.
Two sisters had built a vehicle that could carry a ring through a submerged hoop without touching it.
The gym filled with the cheerful noise of trial runs, minor failures, and parents trying to understand what their children were explaining.
There were no glossy banners and no official winner.
But the machines were real, and their inventors were standing beside them.
Valerie Shaw arrived at one o’clock.
She wore the same practical shoes and carried no sales material.
Colin Mercer came with her.
“We wanted to see what the students could do,” Valerie told Ms. Rios.
“Not what someone claimed they could do.”
The first demonstration belonged to Sam.
His ballast robot sank too fast and settled awkwardly on the bottom.
He retrieved it, adjusted the weight, and tried again.
This time it moved gracefully through two hoops before bumping into a marker.
The audience applauded anyway.
Sam grinned and wrote the problem in his notebook.
Priya and Mateo followed with their rebuilt steering system.
They maneuvered through the narrow course, picked up a colored ring, and returned it to the starting zone.
One of the younger spectators gasped when the robot turned neatly without scraping the wall.
Priya explained the guard design and thanked the classmates who had helped refine it.
Mateo described the mistakes that had taught them how to improve the mount.
Valerie asked thoughtful questions about materials and maintenance.
Colin asked whether the students wanted advice on manufacturing, then made clear they were free to decline.
The children accepted a workshop invitation for later in the year but refused to sign anything on the spot.
Ms. Rios nodded her approval.
Nell took the final turn.
Her machine was smaller than the others, with a plain blue body and a controller she had modified herself.
Before starting, she looked at Carol in the second row.
Her grandmother smiled nervously.
Nell lowered the robot into the tank.
The propellers spun.
The vehicle moved forward, hesitated near the first obstacle, and then turned smoothly toward an opening.
Nell guided it through the hoops and stopped it precisely beside the finish marker.
The gym erupted in applause.
She lifted the robot from the water and held it up.
“I built this because I like knowing why things move,” she told the crowd.
“When it doesn’t work, I want to understand the mistake.”
Her voice shook slightly.
“I don’t want anybody to decide what my mistake was before I even get to look.”
Carol covered her mouth.
Ethan clapped harder than anyone.
The event ended with the students exchanging parts and promising to compare improvements next month.
There was no official prize money, but the school announced a small fund for future materials raised by parents and local businesses.
Valerie offered to provide an independent workshop on how young inventors could document and protect their work.
The students accepted, subject to the school’s approval.
When the crowd began to leave, Nell approached Ethan.
“Did we lose the scholarship?”
“The one Oliver promised, yes,” Ethan said.
“That’s not fair.”
“No, it isn’t.”
Nell looked toward her robot.
“But at least this one is still mine.”
Ethan nodded.
“And now everybody knows who built it.”
