Many high school students do math problems about trains. Fewer win $115,000 in college scholarships by calculating the possible future of U.S. high-speed rail, LiveScience reports. That high-speed rail future may not look too bright, according to some student papers presented at the Moody's Corp. headquarters next to the World Trade Center site on April 26. But the top six student teams who made the final cut of the Moody's Mega Math (M3) Challenge had plenty to smile about — they clustered in celebratory circles around giant prize checks after a long day of explaining how they had applied...

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