4 - 12 years. The Universe is our school, nature our teacher, and every species has a lesson for us. With delightful simplicity, "Lifetimes" introduces some of nature's longest, shortest, and most unusual lifetimes. The lessons for us include: the value of cooperation, the importance of saving for the future, and taking time to have fun. A uniquely engaging way to appreciate nature and consider the fundamentals of life at the same time. Paperback. 32 pages.