John Putnam is art director. Leonard Brenner does production.
Letters from readers - Joe Jacobsen, John O'Leary, Mitchel Silpa, Rob Whitehouse, Stephen Dobanski, Jack Herbert Wilson, Pat Morgan Riordan, Mrs. Robert Brost, Lisa A. Barone, Bill & Sarita McCaw, Heidi Bender, Frank Russo, Alfred Carlos, Joe English, E. Nelson Bridwell (from DC Comics); Dino Salvadore, Andy Roth, Cathy Ehrhardt, Timothy O. Lane and Melissa Hart.
Inside backcover and in color. Answer is: Solar energy.