Possible Data Sources
Here are some popular data sources that you could use as inspiration for your projects.
Compilations of Popular Sources:
Immunizations, Vaccines, and Biologicals: https://www.who.int/immunization/monitoring_surveillance/data/en/
Polio Immunization coverage estimates by country: http://apps.who.int/gho/data/node.main.A831?lang=en
https://www.unicef.org/statistics/ - UNICEF
https://www.healthdata.gov/ - Health data
https://www.congress.gov (Bills cycle, congressional activity etc)