John Grunsfeld, astronaut and associate administrator for the science mission directorate, NASA, speaks to Makayla Stewart, a student from Nicholson Elementary School in Picayune, Miss., second from left, and Anna Lander, a student at Picayune Memorial High School, left, who assisted Nicholson Elementary's team to become finalists in the Samsung "Solve for Tomorrow" contest, winning a $120,000 award, on Tuesday, April 28, 2015 at NASA Headquarters in Washington, DC. They built a prototype robot that investigates city drainage systems to identify problems.

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