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Peter Lenz, 13, was killed yesterday at the Indianapolis Motor Speedway after his motorcycle crashed and he was hit by another racer. Here's an excerpt by Jonathan Welsh of the Wall Street Journal:

"The death of 13-year-old motorcycle racer Peter Lenz yesterday at the Indianapolis Motor Speedway raises the question: How young is too young for kids participating in inherently dangerous motorsports? It is also sure to fuel debate over how motorsports sanctioning groups balance risk and entertainment when putting together programs (like Sunday’s races) that combine amateur and professional events." -- Jonathan Welsh