You can use the following, where $productPids is an array of product IDs.
Using magento model for mass update is a very slow method. However there is a model Mage_Catalog_Model_Product_Action, that is used for mass update in magento admin. You can find its method updateAttributes very useful.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.