Ok, culture will only spread out into water a maximum of 2 tiles. Or as a kind of exact rule

, any water tile must be a coastal tile, or touching a coastal tile.
And galleys (or ironclads for that matter) can travel anywhere in your culture (including ocean tiles). I don't think this is mentioned in the manual and to be honest I've only just noticed it.
1. If you are to cross into an enemy civ's water, i presume you must go directly on to a coastal tile of their's. Is this correct?
2. I am really weak on modern era units. Could someone tell me whether SAM infantry are able to intercept aircraft that are pillaging your improvements. Also when they intercept are they able to kill the unit or just inflict damage?
Oh, and 3. Could someone direct me to a thread which gives details on exactly what certain units will upgrade to and the cost of that upgrade?
Reading through this thread is putting more questions in my head

. So..
4. Considering that chops count as base hammers and are adjusted by modifiers, to what extent do u think it worthwhile to save chops for projects with positive modifiers (e.g. walls with stone), considering that all other base hammers are increased as well and if u chop they will not be producing as a high a yield for as long.