 Powell also conceived the "Britannica's" "Book of the Year", in which a single volume would be released every year covering the developments of the previous year, particularly in rapidly changing fields such as science, technology, culture and politics.The "Book of the Year" continues to be published even today.Powell also introduced the Library Research Service (1936), in which owners of the "Britannica" could write to have their personal questions researched and answered by the editorial staff.