Christian Lawson-PerfectI've just realised that I don't think I've ever met a married couple who have the same birthday, or even heard of one. It shouldn't be that rare, should it?
So: do you have the same birthday as your partner?
Martin Kimber@christianp Hypothesis: couples form, but cannot take the strain of sharing a birthday. Such couples never make it to cohabitation.
Σ(i³) = (Σi)²