Levene enrolled at Columbia University and in his spare time conducted biochemical research, publishing papers on the chemical structure of sugars. In 1896 he was appointed as an Associate in the Pathological Institute of the New York State Hospitals, but he had to take time off to recuperate from tuberculosis.
This graph shows the median age of the resident population of the United States from 1960 to 2015. In 2015, the median age of the United States population was approximately 37.7 years.
List of U.S. states by population. This is a list of United States of America states by Name as of 2016. The list was made using the 2016 Census estimates taken by the United States Census Bureau. The total population of the United States was 308,745,538 at the 2010 Census, and was estimated to be 318,857,056 in July 2014.