President James Polk died four months after leaving office, at the age of 53. His wife lived for another 42 years. Source: AmericanPresidents.com

President Eisenhower named the presidential retreat Camp David after his grandson. President Franklin Roosevelt previously had called it the “USS Shangri La.” Source: WhiteHouse.gov  

Air Force One, the call sign of any Air Force aircraft in which the president flies, is in practice used to refer to one of two Boeing 747-200B series aircraft, which have been customized.  Source: WhiteHouse.gov

The president’s aircraft, Air Force One, has a doctor on board at all times and has a medical suite that can function as an operating room. Source: WhiteHouse.gov

Residential property burglaries accounted for 67.9 percent of all burglary offenses in 2007 in the U.S. Source: FBI Uniform Crime Reporting Program

There were an estimated 2,179,140 burglaries in the United States in 2007. Source: FBI Uniform Crime Reporting Program

Under the Fair Labor Standards Act, the minimum wage was originally 25 cents per hour on Oct. 24, 1938. Source: Department of Labor

As of July 24, the federal minimum wage in the United States is $7.25 per hour. Source: Department of Labor

On today’s date in 1897, aviator Amelia Earhart was born in Atchison, Kansas. Source: Amelia Earhart Birthplace Museum

There are about 10,000 bird species in the world. Source: National Geographic