I signed the lease to my new apartment this afternoon, but then I made the mistake of trying to do the math in my head on the way back to work. I am financially stupid, you must understand, and there are times when simple arithmetic is seemingly beyond me. I think I’ll be okay, although there are a few days of overlap in late July when I’ll owe both landlords money, and it looks like that month-long trip to Cancun will just have to wait.