My theory is that like ones metabolism, memory does the same mean sneaky thing. Sometime from the age of about 50 on, you go to bed one night with all faculties intact and wake up the next moring to find the two M's have crept away during the night. memory comes back in fits and starts, but I'm darned if I know where metobolism has gone to. Along with single socks, there must be a veritable "Bermuda Triangle' full of metabolisms somewhere