SHERIDAN — Teri Rowland, a science teacher at the John C. Schiffer Collaborative School, used commencement exercises Saturday for the 18 members of the school’s class of 2021 to impart one final lesson, for them to remember to use the skills they’ve worked to master over the past few years.

She did it all with a couple of balloons and a match, to the delight of the packed audience at the Whitney Center for the Arts at Sheridan College.

One balloon was filled with helium, which popped harmlessly. The other was filled with hydrogen and exploded.

Then, Rowland brought a third balloon to the center of the stage. This time, however, she didn’t look to see what it was filled with or what the reaction would be if she put the match to it, as she did with the others.

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