Are physical sciences a category of Engineering? If so then your graph proves your point, if not then I don't see it. What am I missing? This is what Google

Are physical sciences a category of Engineering? If so then your graph proves your point, if not then I don't see it. What am I missing? This is what Google told me it was. http://study.com/directory/category/Physical_Sciences.html http://study.com/directory/category/Physical_Sciences.html