Well documented though they may be, these two sets of facts run up against the assumption of many Americans that a society where religion is minimal would be, in Mr. Zuckerman's words, "rampant with immorality, full of evil and teeming with depravity".
But given this, it follows that the truth of empirical science depends upon two sets of facts that hold or don't hold independently of one another.
It begins (715a1 18) by noting that it will explain two sets of facts left unexplained in PA: the differences among the parts related to generation; and the generation of the parts generally.
P3 says that the following is true of every proposition p which can be true: for every world where p is true, there are two sets of facts G and H such that (i) in w, all members of G exist and none of H do, and (ii) in every world where this is the case, p is true.
All of them were motivated by two sets of facts, both well known within the development world but not widely discussed outside.
Along the way, the entire thing has gotten so tangled in left/right politics, apocalyptic rhetoric, demonized opponents, shout-down meetings, and two sets of facts that it's almost impossible for the sides to talk to each other, or, for that matter, anyone who doesn't agree with them.
They may satisfy readers who want one point of view or one set of facts always emphasized, but they can get in the way of nuance and real understanding.
In a narrow ruling in the sense of applying law to one set of facts, the Supreme Court has provided an admirable reminder of how broad the protection of free speech is under the Constitution's First Amendment, including hurtful and hateful speech.
[With] natural events, you're dealing with one set of facts following the other.
What you can do relative to one set of facts, is something you cannot do relative to another set of facts.
