When you’re walking in the vicinity of a chemical fire and getting a whiff of the toxic fumes, I would like to see a science fair project exploring the relationship between a person’s recoiling reaction to the bad smell and the effects the fumes are having on them. When you smell a sick thing, you do actions like nose wrinkling and looking for clean air. If you breathe certain toxins, they will do things to your brain that will make you move about erratically, seizure, also potentially vomit, and a long list of other symptoms that I would be familiar with if I worked around hazardous materials. Of course, the point at which the nose wrinkling and similar actions turned into the effects of the toxins in your system would depend on the toxins involved. A grand prize science fair project would need to include this relationship for a minimum five toxins, stating common name and chemical formula on proper graph axis vs voluntary and involuntary symptoms vs exposure time. Yes, three dimensions, but it could be visualized with modeling. Now students must read this post.