Provided by the University of St. Andrews, Scotland, MacTutor is a comprehensive archive that contains biographies of over 1100 mathematicians, from Niels Abel to Antoni Zygmund. Mathematicians can be accessed alphabetically or chronologically. Biographies contain birth and death information, along with a synopsis of the mathematician's work and references. The site is searchable, and is one of the most exhaustive mathematics history sites on the Internet. The list is arranged alphabetically by subject, allowing the user to easily locate a service on a specific topic if it is provided.
Some services promise to answer each question personally.
Others state that due to volume they can answer only selected questions but will publicly post those they do answer. Many services offer listings of previous questions, with the answers. A random sampling of the services provided indicates that some are very well done where as others may not be as useful. The American Museum of Natural History web site gives information about all of the museum's current pursuits, including exhibitions, education, and research. Users may take virtual tours of the Fossil Halls and the museum's 125th anniversary exhibition.