This animation is the fourth part of a series that introduces the scientific method with the help of a real-life example: roots around water pipes in your backyard. In this animation, we explore the refinement of a hypothesis, which is often an essential step in the scientific process. The animations of the pathway, “Rooted in Science: Smart Plants and the Scientific Method” are connected by a single narrative and are intended to be followed in a chronological order. If you have just joined us, we encourage you to start this pathway at the beginning with the first animation, “Smart Plants: The Scientific Method Is for Everyone.”