The sound of revving engines will echo across the Sonoma Valley this weekend as NASCAR's favorites take center stage at the 26th Annual Toyota SaveMart 350. But what if drivers could race using something completely green -- like, say, gravity? That's not likely, but it's a question one group of kid "engineers" is trying to answer just miles away from the Sonoma Raceway. Tena Rubio teamed up with KQED's Danny Bringer to bring us this story.
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