At the time of publication, all of the children’s books included in Perfect Pairs were in print. Authentic science always begins with a question, with a fleeting thought, with a curious person. Some of the vocabulary included in the NGSS Performance Expectations will be challenging for early elementary students, and yet student assessment tests may include these difficult terms. Teachers guide students in developing and carrying out a plan to find, collect, and organize information that addresses the Wonder Statement. In the Next Generation Science Standards, each Performance Expectation (PE) is accompanied by a list of Common Core standards that the NGSS developers believe can be addressed through a science investigation related to that PE. A Wonder Journal’s fluid format encourages creative problem solving.