Former Delaware Senator Joe Biden was elected the 47th U.S. vice president with President Barack Obama in 2008. He earned a second term as vice president when Obama was re-elected to the presidency in 2012.
In 1996, Dominique Dawes won Olympic gold with the U.S. women's gymnastics team as well as an individual bronze medal—becoming the first African American to win an individual Olympic medal in women's gymnastics.
Astronomer Edwin Hubble revolutionized the field of astrophysics. His research helped prove that the universe is expanding, and he created a classification system for galaxies that has been used for several decades.