A Word or Two of Explanation

I can't figure out any other way to publish "hidden" posts - stuff that doesn't correspond to the regular chronology or topic of the blog, such as background information or long off-topic posts - so I am going to give them a false date and park them all here. So if you're curious about the Feb. 2000 archives - they're kind of the Twilight Zone here at Addition Problems. I thought that Feb. 29 was a good date for them!