torquil
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Maybe it reduces wave motion on the fluid surface, leading to less spillage as he walks around with the cup?
You mentioned that he said it also works with a spoon, but I haven't really noticed much difference when walking around with a cup with/without a spoon in it. But perhaps there is a small difference that he feels is significant.
You mentioned that he said it also works with a spoon, but I haven't really noticed much difference when walking around with a cup with/without a spoon in it. But perhaps there is a small difference that he feels is significant.