For the lab safety unit of his seventh-grade life science classes, teacher Ken Arbaugh decided to spice things up.

He invited firefighters from the Nevada City fire station to start small fires in a trough on the side of Seven Hills School Friday morning.

“I'd never used [a fire extinguisher] before, but now I know how to put fires out,” said Conner Upton, 12.

For more on the story, read Saturday's edition of The Union.