This Day in History; July 21; -American astronauts Neil Armstrong and Buzz Aldrin become the first people to walk on the Moon (1969)
-First major battle of the Civil War, the 1st Battle of Bull Run (1861)
-Last Space Shuttle mission, STS-135, lands at Kennedy Space Center (2011)
-Last Harry Potter book is published (2007)
-Tsunami destroys the city of Alexandria, Egypt (365)