Super plurals are statements that are true of pluralities of things, but in which the truth cannot be composed of the parts. So “Those folks wear black t-shirts” is not super plural since it is dependent on each of “those folks” wearing black shirts, but “those folks co-operate” truth conditions are dependent on some property of the group that cannot be reduced to its parts.

So why care about superplurals?

How is it that something can be true of many things but not of each of the things in isolation? This is a problem for the idea that we can derive all there is to know about a plurality of things from a complete record of all of the things that are true of its composite parts.

I have not the slightest idea how this could be?

When something is true, it is true of something. “Bob wears a black shirt” is true of bob. If this is the case, what is a superplural true of? If it is true of the group, why can we not derive its truth from the composite parts of the group?

What is going on? I have not the slightest idea!