Show-and-tell was a breeze in first grade, when Gus brought to school baseball cards and a plastic rattlesnake and a super-duper flashlight. Now, in second grade, he's stumped. And wouldn't you know it, rival Ryan Mason outshines him every time. When Gus brings a picture of a beaver lodge for his natural-habitat project, Ryan brings a huge, homemade model of a beaver lodge. When Gus brings a balloon for his solid, liquid, or gas, Ryan makes gas out of vinegar and baking soda. Will Ryan's show-and-tell for Colorado history also be superior to Gus's? No way -- not when Gus decides that his show-and-tell will be Grandpa, the best representative ever of Colorado history, and the best grandpa, bar none. Once again, Claudia Mills and Catherine Stock reveal the riches of "one of the nicest intergenerational relationships" (The Horn Book).