I just learned about this. Intriguing model, re: having people get access to their health data (US). Haven't explored all their terms and conditions, but pretty interesting if it works.
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"More than at any time in human history, we have access to mountains of data about ourselves. Hacking H(app)iness is the first book to show us how to leverage this information as a path to happiness, rather than a source of misery."
-Adam Grant, Bestselling author of, Give and Take