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In Boca Raton, Florida, 15-year-old Hannah Herbst built a roughly $12 ocean-current energy probe with a 3D-printed propeller, lit LEDs in Intracoastal tests, and won $25…

Hannah Herbst won the Discovery Education 3M Young Scientist Challenge in October 2015, at the age of 15, with a propeller ...

Mumbai Floods

Read Mumbai Floods latest news on The Economic Times. Mumbai floods latest updates, floods in Mumbai news, Mumbai weather ...