This paired text science unit focuses on helping students answer this Big Question: How do unseen forces move things around? This unit contains two lessons and a unit assessment. Each lesson includes teacher support pages, a dictionary, a reading selection, and a variety of written and oral activities, including reading comprehension, close reading, vocabulary, and text-based writing activities. The reading selections in this unit are: Setting Things in Motion (Level R) and The Case of the Ruined Picnic (Level P). An answer key is also included.