Geology. Some very important rocks were literally picked up from the surface. All rocks are not the same.

In many ways, the Moon has not changed in billions of years. Sure, there's a couple of meters of dust on the top layer. But can we find some of the original rocks? What were they like? Eg the genesis rock.

Many of the rocks are breccia, sort of everything-compressed-and-fused together.

What would it mean to find little beads of orange glass?

How thick is the crust of the moon? Is there a molten core?  What causes the localized magnetic fields? Is there water? Was there water in the past?