Stories by FactCheck.org

Mammography screening rates by state for women aged 40 and older who had a mammogram within the previous year range from 48.7 percent in Oklahoma to 71.4 percent in Massachusetts. 
Source: American Cancer Society

Mammography detects about 80 percent to 90 percent of breast cancers in women without symptoms, on average. The testing is somewhat more accurate for postmenopausal than premenopausal women.
Source: American Cancer Society

The tomb of Christopher Columbus is in the Cathedral of Sevilla in Spain.
Source: CatedralSevilla.es

While white women have a higher incidence rate of breast cancer than African American women at age 45 and older, African American women have a higher incidence rate before that age and are more likely to die from the disease at every age.
Source: American Cancer Society

Women aged 20-24 in the U.S. had the lowest incidence rate of breast cancer from 2002-2006, at 1.4 cases per 100,000 women. The 75-79 age group had the highest incidence rate, 441.9 cases per 100,000 women.
Source: American Cancer Society
 

The estimated new cases of breast cancer in the U.S. for 2009 are: 192,370 women and 1,910 men. Estimated deaths are 40,170 women and 440 men.
Source: National Cancer Institute

The U.S. Postal Service has 656,000 career employees.
Source: USPS

An average of 667 million pieces of mail are processed each day by the U.S. Postal Service.
Source: USPS

There were 14.2 million computers in U.S. schools, as of the 2005-2006 school year.
Source: Census Bureau