Science fair projects have become much cooler since the days of growing lima beans under different-colored light filters, LiveScience reports. This year's winners of America's top science honors for high school students used nanotechnology to destroy cancer stem cells and turned Microsoft's Kinect gaming sensor into a design tool for prosthetic limbs. Their reward: $100,000 scholarships for college. A $100,000 individual grand prize went to Angela Zhang, a senior at Monta Vista High School in Cupertino, Calif., whose nanoparticle system not only allows for noninvasive imaging of tumors, but also delivers drugs to attack cancer cells. Another $100,000 team...

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