A 13-year-old girl built a water filter out of corn cobs farmers throw away. Lalita Prasida Sripada Srisai, from Koraput district in Odisha, won the Communit...

A 13-year-old girl built a water filter out of corn cobs farmers throw away. Lalita Prasida Sripada Srisai, from Koraput district in Odisha, won the Communit...