For more than two decades, Prof. Anil Gupta has scoured rural India for its hidden innovations, motivated by the belief that the most powerful ideas for fighting poverty and hardship won't come from corporate research labs, but from ordinary people struggling to survive. Gupta and his aides have uncovered more than 25,000 inventions, from the bicycle-mounted crop sprayer to the electric paintbrush that never needs to be dipped in a paint can. Many of the cheap, simple ideas he spreads for free from one poor village to another with the inventor's blessing. Some he is working to bring to market, ensuring the innovator gets the credit and the profit that will spur others to create as well.

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