My daughter (4) loves to do science experiments and build molecular models with me. But in this clip, at 2:50, she farted. It's hilarious. Ms Marie wants to build a model of an a molecule of an orange (the fruit). A little bit of research showed that oranges are composed of water, sugars (glucose, fructose, sucrose) and citric acid. Since we had built a fructose molecule the night before, we decided to build models of a citric acid molecule and a glucose molecule.