The main way in which a cataract can serve as a natural protective barrier is by reducing the amount of UV radiation that enters the eye from sunlight, which is also why it can lead to blindness, however.
Ellis island was originally built and opened as an immigration station.
Economic - several writers have noted the role of monastics as entrepreneurs.
Social - any good text about medieval monasticism can give you plenty of specific examples of this.
Missionary - some orders were more active in this regard than others.
Cultural - this is perhaps the best known of the work of medieval religious orders and included the creation of the great illuminated manuscripts of the age.
<span>(1) No two people agree on just what would be "fair".
(2) Even if there were agreement, the people with political clout have no reason to want a "fair" system; they want a system that benefits them. There is a reason the Republicans have been pushing through tax cuts for the rich.
(3) The tax "system" includes all the taxes: local, state, and federal. If you want the entire system to be fair, it has to be changed as a whole, not piece by piece. And that would make it hard to start and hard to maintain (any change in tax rates would also have to be coordinated) </span>
