But today's big mail: my Permanent Resident Card, a.k.a. the Green Card, arrived. Disappointingly, it's not green; mostly white, with a photo and a thumbprint.
It's supposed to remain "in my possession" at all times — which seems to be a rather vague stipulation; some USCIS documents, for example the (slightly patronising) Guide For New Immigrants say that it must be carried at all times, while others suggest that all you need to be able to do is produce it when requested. I think I'd best play it safe...
Still no SSN. Grrr.