First lady Michelle Obama joked about the explosion of a solar-powered car when encouraging graduates of Oregon State University to persevere through life’s challenges.

The first lady was the commencement speaker Sunday at OSU in Corvallis, Ore., where her brother, Craig Robinson, is the men’s basketball coach.

“In those darkest moments, you will have a choice,” the first lady said. “Do you dwell on everything you’ve lost? Or do you focus on what you still have, and find a way to move forward with passion, with determination, and with joy?”

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