Advancement of knowledge: ortho-molecular psychiatry, by L. Pauling.--Education to meet a changing society, by B. C. Keeney.--The future of political thought and political institutions, by C. Frankel.--Challenges for tomorrow, by P. Abelson.--Men and machines, by E. E. David, Jr.--World food production potential, by D. G. Aldrich, Jr.--A look at the next 100 years, by F. H. Harrington.--The land-grant idea as a working process: the search for a relevant education, by W. R. Parks.