In addition, the items that you can see in the buy/sell window at the bottom of the list marked alien artifact, are worth more after they have been identified and researched. Don't sell them before they are identified unless you are desperate for cash.
 

<t> Sounds to me like you are still waiting for the Battleship. Go to your UFOpedia and look at the alien ships. If you don't see battleship yet that is your problem. This is a larger ship than the Battlecruiser and usually does not appear until late 2009 to early 2010. Once you complete a mission ...

Have you built the interogation room? If so have you captured more than 12 of them? That is the limit of Commander research. Perhaps you are stuck because you have not captured the largest ship yet? It does not show up for quite a while.
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You need to get beyond the lasers. Once you get to the plasmas and ions, the "robots" become much easier to deal with. In order to unlock the plasma tech you will need to capture an alien commander.
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<t> these are aproximate from another thread - not my numbers<br/>
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0 15&nbsp;&nbsp;&nbsp; &nbsp;//Private &nbsp;&nbsp;15 <br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1 35&nbsp;//Private first class&nbsp;&nbsp;&nbsp;<br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ...

Only one crash for me. My daughter and I have each finished the game twice so we have many hours of play.

I have finished the game twice. I found the base defenses to be worthless. You need to either intercept the aliens with you ships, or let them capture the base and then retake it with ground combat.

There are 2 things I can think of. Either you have not built an interogation room or you have researched the maximum required of 12 commanders. After 12 you can't learn anything new.

Good question. I have never been able to find a way, but there may be a hot key.

<t> It is the start of the endgame. You will have about 5 missions on Earth to complete. You will not be able to produce or purchase anything on Earth so bring plenty of ammo and stim packs. I just finished a game on medium level and also never had to take an alien base. I think if you are very ...

I keep getting shot at from rooftops by aliens but when I am on a roof, I can not shoot down on them. Hardly seems fair.

Any scout that I have shot down with these has been unrecoverable. Larger ships seem to be fine.

You can buy only basic irems that are available today - shotguns, rifles, grenades, rocket launchers, etc. All of the improved items must be researched and constructed.

Not sure but I think there is a readme file with the patch

another thread states that the first battleship should arrive between June 2109 and April 2110. I am in my 2nd game but I did not notice when they first showed up for me.
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I believe it is strictly a time thing. You will probably see them soon
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You won't need storage or additional living quarters. Storage seems unlimited. Scientists and workers seem to live in their workplace. Soldiers are limited to 20.