NewScientist The Last Word - Tag 'grounds' details

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What causes coffee grounds to dry into the pattern shown at the bottom of this coffee cup (see photo)? Larger grains seem to be repelling smaller ones, but the smallest ones don't repel each other. What's going on? Hugh Young, Pukerua Bay, New Zealand
Editorial status: In magazine. (1 vote) average rating:3 There are 4 answer(s) for this question. View answers \| Submit an answer