In my early days as a TA some years ago, the teacher explained to the pupils that they needed to measure 150ml of liquid.
My charge and I looked at the equipment. The 150ml tubes were all in use so we waited until other pupils had completed the experiment.
The teacher asked what we were waiting for. I explained the issue. He looked me in the eye and said, “perhaps you could use two 100ml tubes?”
I don’t think I’ve ever felt more embarrassed. Before or since.
Good Morning Saturday 18th July 2026



