I'm no longer "new to mac" and have had my second desktop for a couple of years. For some unknown reason iPhoto has duplicated photos possibly when I upgraded the program or when I transferred files from the old computer to the new. Some of the older photos have 5+ copies! Even the newer ones end up with a duplicate shortly after I upload. I wonder how to set iPhoto to stop doing this and also any recommendations for a good mac program that deletes duplicates? I've saved photos to a removable device and backed up my computer to an external hard drive so I'm ready to experiment. Any help would be appreciated.