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Morning Rundown: Student protest arrests across the country, mom says ex-cop 'brainwashed' teen girlfriend before double killing, Venice tries to deter day-trippers

A Roundup of This Week's Scientific Breakthroughs

Mach's series "Pioneering" covers the latest scientific breakthroughs. In this week's round up, why we love Pi Day so much, snowflakes under a microscope and a robot that can flip burgers.