Aug. 1 (UPI) -- Those born on this date are under the sign of Leo. They include: -- Roman Emperor Claudius I in 10 B.C. -- Explorer William Clark in 1770 -- Writer/lawyer Francis Scott Key in 1779 -- Writer Herman Melville in 1819 -- Activist Mary Harris "Mother" Jones in 1837 File Photo by Bertha Howell/Library of Congress -- Businessman Charles Clinton Spaulding in 1874 -- Photojournalist Gerda Taro in 1910 -- Henrietta Lacks, cancer patients whose cells became the subject of medial research,