[This is a template used to create a new Spark!Lab lesson weekly. All bolded and italicized text in brackets will be deleted in final versions.] In this Collection, you'll explore [theme: the problem in common solved by each of the featured historical objects] throughout history. Then, using [knowledge and exercises completed: i.e., "...what you learned..."], you'll [sketch, create, tweak/redesign, or make a pitch for] your own [learning product of this lesson]. *** IMPORTANT! *** Always click the "paper clip" icon (top-left) when viewing an object. It gives you information, assignments, and instructions for a closer look.