This volume on "Scientists and Inventors" was created to appeal to young readers in a format they can enjoy reading and can readily understand. Each volume contains alphabetically arranged sketches of outstanding people. Each entry provides at least one picture of the individual profiled, and bold-faced rubrics lead the reader to information on birth, youth, early memories, education, first jobs, marriage and family, career highlights, memorable experiences, hobbies, and honors and awards. Each of the entries ends with a list of easily accessible sources designed to lead the student to further reading on the individual and a current address. Obituary entries are also include in the volume, written to provide a perspective on the individual's entire career. Obituaries are clearly marked in both the table of contents and at the beginning of the entry. Entries in Volume 6 are: Hazel Barton (1971- ); Alexa Canady (1950- ); Arthur Caplan (1950- ); Francis Collins (1950- ); Gertrude Elion (Retrospective) (1918-1999); Henry Heimlich (1920- ); David Ho (1952- ); Kenneth Kamler (1947- ); Lucy Spelman (1963- ); and Lydia Villa-Komaroff (1947- ). (Contains a general index, a place of birth index, and a birthday index.) (BT)