@nikgame:
1) This means that for every 10% of culture being generated, your city will get 1 extra happiness point. So: 10 culture = 1 happiness, 20 culture = 2 happiness, etc. You get the happiness in addition to the culture not instead of it.
2) When there is no improvement to destroy the tile will be greyed out for that option. Air units can only damage ground units to 50% of healthy strength, so when all the ground units on a tile are at 50% health or less, the tile will be greyed out for that option. Also, any tile that is out of range will be greyed out if your plane tries to attack it.
3) Fighting costs one movement point.
4) First strike is when the unit is immune to taking damage for one round of combat. You will only see this if you have the combat log active, since all combats are fought round after round until one unit is destroyed or retreats, once you attack or are attacked. +1 First Strike Chance means the computer "rolls the dice" to see if the unit gets a First Strike or not. +1 First Strike means the unit definitely gets the free round. +2 means two free rounds, etc.
Also why is it that at times some of the espionage missions are not executable ?..like at times for eg: the "steal technology" doesnt show up while the spy is in another civ's city.
You have to have enough espionage points (EP) to carry out the mission, in that city. You can see how many EP you have in each foreign city by looking at the Espionage Screen (the last icon in the upper right corner of your main screen). It will also tell you if that is enough EP for whatever mission. It varies from city to city. So, pick a cheap one!
