Defining disability is a fairly major process in America. We're making a decision about who does and doesn't qualify for the ADA who needs assistances of various kinds. And so, we have two basic ways of thinking about defining disability. One is by medical diagnosis that you have a medical condition that leaves you disable. This could be spina bifida, it could be multiple sclerosis. It could be blindness that limits your abilities. Another way, a more social way of thinking about it is what are your physical limitations? What can you lift? What can you see? What can you understand? What can you perceive? All of these have to do with functional limitations or functional abilities. So when we move beyond that, we start talking about categories, and one category are people, who from birth have experienced the difference. We call this category developmentally disabled. It can be a physical disability like cerebral palsy. It can be a learning disability like learning capacity, it can be related to a sort of psycho-emotional disorder like autism. And so, we have many different forms of developmentally disabled. And then, there are various physical limitations, sight, hearing, limbs, breathing, heart condition, all can physically limit your ability. And then, there are mental limitations that not having a different perception of reality, having mood disorders, falling in depression, and becoming manic, a number of areas there. And then, there are emotional capacities. Their capacities to work with other people, their capacity to accept direction, their capacity to consistently turn up. These are emotional parts of the disability world that can be assessed. And finally, there is the long-term use of mind-altering substances. So with alcohol, it can be DTs, delirium tremens, it can be cirrhosis of the liver, long-term effects of alcoholism. With hallucinogens and some stimulants, you're going to end up finding people who are so overly charged or developed that they are no longer really functioning, and they fall into an area that might be related to mental illness. But the employer's willingness to hire, the employer's willingness to say, this person has the capacities that I need, and generally the employers across the workforce. So if no one's willing to hire you because they don't believe you're capable, in one sense, that's the definition of disability. So when we think about disability, there's short-term critical care, someone's in a car accident, someone has a stroke, someone is in a position where medical care can get somebody back functioning, heart attack. And that often involves rehabilitation, some kind of exercises or redefining a function to develop function. This can involve full recovery, partial recovery, or limited recovery. The military has many people who are disabled by being involved in combat, and they have an assessment where they say you are 30% disabled, 60% disabled, 80% disabled, or fully disabled. And they give pensions based on that in that way. Then another dimension is long-term care. So people who are going to need assistance, maybe in basic bodily functions although than another ways, they can function quite well. Transportation assistance, some people will need aids to work with equipment like computers or keyboards, that once those are fixed, they can function at a very high level. So long-term care and supports are an essential part of disability. And then, there are other folks who are going to need those assistances, simply to live, and that will not bring them into a place where they're functioning in the labor market. So thinking about disabilities, it's a complicated area. You will be involved for the rest of your life when you're thinking about social welfare, thinking about what is, who is, and how do we define disability.