My grad school advisor and I were out walking once and went into a
coffee shop. Ordered coffee, which they served in clear glass mugs.
Added cream, which, being cold, sank.
Gently blowing on the top of the coffee set up convection currents,
leading to a pattern of hexagonal cells, not so very unlike the
solar photosphere, and for similar reasons.
Put fluid mechanics in the presence of hot coffee and they'll just
watch it get cold.
Oh, and they sold us two sets of clear glass mugs before we left
the shop.
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