Biological aging can be modified substantially through

Biological aging can be modified substantially through changes in one's behavior and environment. For instance, one can improve his nutrition by eating healthier foods. Moreover, one can seek medical treatment in order to regulate one's health. These lifestyle changes can add up to 30 years in life expectancy in developed nations, as studies have recorded. 

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey