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By the Author
![The Secret Pulse of Time](https://www.hachettebookgroup.com/wp-content/uploads/2017/06/9780738212562.jpg?w=178)
The Secret Pulse of Time
![The Science of Happiness](https://www.hachettebookgroup.com/wp-content/uploads/2017/06/9781569243282.jpg?w=190)
The Science of Happiness