Propositions are things that can be true or false

physical possibility (which applies to things that are consistent with all the physical laws,

“validity” does not require the premises of the argument to be correct,

generalizes from particular cases. Example:

epistemic possibility (which applies to things that are consistent with everything we know)

They can be necessary or contingent.

an intuition is a mental state that you have in which something just seems true to you, upon reflecting on it intellectually, in a way that does not depend upon your going through an argument for it.

Science, by contrast, does not appeal to supernatural knowledge sources to justify its theories. It appeals most prominently to observation, especially specialized observations.

“Neutrality” is a matter of not taking a stand on a controversial issue.