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Reminiscent of Mary Pope Osborne's Magic Tree House series, this book is one in a collection about two children who go on educational and often death-defying adventures while navigating the challenges of middle school and family life. Thinking about the universe always triggers my existentialism and the storyline is difficult to swallow, but it's not a bad introduction to some thorny physics...for kids. My 11-year-old seems to be enjoying it.