I have just a few simple questions about SV.

Is there any way to tell how much time has passed for the villagers? It'd be nice to know how much longer my villager will be nursing (I know they nurse for 2 yrs).

When something says that it requirers more research, does it mean just points, or an upgrade in something?

Last one. If there are enough points, or upgrades, can any of the villagers solve the puzzles or does it have to be certain ones? For example, right now I'm at the point where if I take a sim to the rock the screen says they could carve on it, but they are confused and then the screen says it might require more research.

Thanks,
Rynn