Short Term Memory?
I could not remember what my blood sugar was! In the fraction of a second that it took me to read the result and position my mouse pointer on the computer, the number was gone. Vanished. Nowhere to be found in the vast space of empty that is sometimes called my brain.
I paused, thinking to myself "I couldn't possibly have forgotten that number so quickly". I was kind of disturbed and worried.
I actually had to turn back to the meter and pull the number out of the memory!
Our lives are so full of numbers that sometimes a few of them fall through the cracks I guess.