Tapa blanda, 210 páginas
Publicado el 1977 por Alianza.
Tapa blanda, 210 páginas
Publicado el 1977 por Alianza.
Answers to questions in various scientific disciplines, e.g., "What are pulsars?", "Is the universe running down?", "What is the difference between a brain and a computer?", and "Why did the dinosaurs die off?".