The map of flu activity across the United States continues to darken, both figuratively and literally, as case numbers spike ...

California is the most populous state in the United States and a global economic powerhouse ... warmer temperatures lead to the spread of mosquito-borne diseases like Zika and West Nile virus, and ...

Americans are heading to primary polls and caucuses to support the presidential candidate they want to represent their party on Election Day in November. Pledged delegates are selected to ...