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Bill Gates says she's changing the game. So does Al Gore. Tech teen Emma Yang, who grew up in Hong Kong and now lives in New York, loves her grandmother so much, she's created an app that uses facial-recognition technology to ensure that her family - and potentially millions more - can communicate meaningfully with people with Alzheimer's. James Chau met Emma in New York, where she gave him a preview of her Timeless app and discussed how humanizing technology can help create a better world.