At home, we celebrated the club’s honorable mention with grilled cheese sandwiches and tomato soup.

Selena showed me a diagram of a new project she wanted to build.

It involved monitoring water quality using inexpensive sensors.

“Can engineering help towns with bad drinking water?” she asked.

“Yes,” I said.

“It already does.

And people are always finding new ways.”

She traced a line on the sketch with her finger.