REPLAY: President Obama Speech at democratic convention live DNC Democratic National Convention - YouTube

REPLAY: President Obama Speech at democratic convention live DNC Democratic National Convention - YouTube

Walter S. McAfee is the African American mathematician and physicist who first calculated the speed of the moon.  McAfee participated in Project Diana in the 1940s - a U.S. Army program, created to determine whether a high frequency radio signal could penetrate the earth’s outer atmosphere. To test this, scientists wanted to bounce a radar signal off the moon and back to earth. But the moon was a swiftly moving target, impossible to hit without knowing its exact speed.

Walter S. McAfee is the African American mathematician and physicist who first calculated the speed of the moon. McAfee participated in Project Diana in the 1940s - a U.S. Army program, created to determine whether a high frequency radio signal could penetrate the earth’s outer atmosphere. To test this, scientists wanted to bounce a radar signal off the moon and back to earth. But the moon was a swiftly moving target, impossible to hit without knowing its exact speed.

dandridgelove:  Dorothy Dandridge, Joyce Bryant, Lena Horne, and Diahann Carroll are legendary women who continue to inspire and captivate generation after generation with their magnificent beauty and talents!

dandridgelove: Dorothy Dandridge, Joyce Bryant, Lena Horne, and Diahann Carroll are legendary women who continue to inspire and captivate generation after generation with their magnificent beauty and talents!

Vivien Thomas, African-American surgical technician who developed the procedures used to treat blue baby syndrome in the 1940s.  Thomas was also offered the position of Chief of Surgery at his alma mater, Johns Hopkins in 1941.

Vivien Thomas, African-American surgical technician who developed the procedures used to treat blue baby syndrome in the 1940s. Thomas was also offered the position of Chief of Surgery at his alma mater, Johns Hopkins in 1941.

Nathan Francis Mossell (1856-1946) was an African American doctor who helped establish the first black hospital in Philadelphia.

Nathan Francis Mossell (1856-1946) was an African American doctor who helped establish the first black hospital in Philadelphia.

black history inventors and inventions | ... dramatically in the story of African Americans in aerospace history

black history inventors and inventions | ... dramatically in the story of African Americans in aerospace history

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