We were doing an experiment in science class, and part of their assignment was to find the mass of some marbles. The students were using a small electronic scale with a flat top.
I was attempting to give some guidance on how to mass the marbles without them rolling off the scale. "Take your little cup and lay it on the scale. You should have the mass of the cup showing." I said. They had to get rid of that number in order to find the mass of JUST the marbles. We had been over this before, so I asked, "Now what do you hit?"
A voice from the back answered, "Rock bottom!"
They were right.
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