Four of the 19 persons selected as prize fellows by the John D. and Catherine MacArthur Foundation specialize in the earth, ocean, or space sciences. The four are John P. Holdren, Robert W. Kates, Paul G. Richards, and Joseph H. Taylor.The awards, ranging from $24,000 to $60,000 annually for 5 years, are unrestricted; the recipients may pursue any field of endeavor and are not required to publish a paper or to meet similar requirements. The exact amount of the award is dependent on the recipient's age; older prize fellows receive larger awards than do younger ones.