This document discusses the potential for sensors and big data in health and well-being. It highlights Google Flu Trends, which was found to be wrong in its predictions 100 times out of 108 weeks. It also discusses the challenges of big data in health, including issues with data variety, veracity (accuracy of sensors, manual entries, and missing data), and privacy concerns. The document promotes tracking health metrics like exercise, weight, and calorie intake but notes the ecosystem is still facing challenges to realize its full potential.