by teflon
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photos from the martin-o-phone.
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Thought I'd let you know that I've just wasted twenty minutes on that question.
My answer would be a big fat eeeemmm, I dunno. Although the square shape would certainly lower the risk of a 'swirl' building up, spilling hot tea into your train-going lap.
Here's another science-related puzzler though: the other day I witnessed Morven pouring exactly one mugs worth of water into an empty kettle, on the basis that she wouldn't be wasting electricity boiling water that would just be left to cool. However, I reckon that the water would heat quicker if a strong convection current was allowed to develop in the kettle, which would require a larger amount of water. Hmm. She thought I had too much free time on my hands. Am I right? Opinions?
And did you know that hot water freezes faster than cold water?
What a long post... I'll just get back to doing something useful now.