Okay, here's one for the books...
As I read various threads I am shocked and dismayed at how many of us do not know the difference between the words then and than.
Then is, primarily, an adverb used to indicate "at that time: soon after that: next in order of time <walked to the door, then turned>".
Than is, primarily, a conjunction "used as a function word to indicate the second member or the member taken as the point of departure in a comparison expressive of inequality; used with comparative adjectives and comparative adverbs <older than I am>".
Yes, this may seem silly to many of you, but I just hate seeing the continuing decline of a perfectly good language, especially when that decline is furthered by so many knowledgeable and intelligent people.