Where Did Monday Come From?

I don't mean the origin of the word, which I find fascinating, and for a while at least, dominated my twitter stream. What I want to know is: how did it get to be Monday already?

Einstein once famously explained relativity by saying a hand on a hot stove for a moment can seem like an hour, and an hour with a beautiful woman can seem like an moment. In the same way, weekends, although two days long, generally go much faster than I'd like. Relativity again. It's science, and it sucks.

Anyhow, I'v...