I'm finally getting around to organizing my 20,000+ photos in iPhoto. I am attaching keywords to the individual pictures and have noticed something very curious: When I go to iPhoto's search box and type in a keyword, often many pictures that are not tagged with that keyword are returned. For example, I can type in the keyword "sign" and pictures from my wedding are returned as though they contain this keyword. I've double-checked the picture filenames, descriptions, faces, kaywords, and places, and nowhere do I see the word "sign" associated with these photos. Does anyone know why this is happening? TIA for any assistance. I'm frustrated, having spent all this time associating keywords to my photos, only to have the keyword search option not effectively work for me!