[youtube=http://www.youtube.com/watch?v=elu5Rm_Tjx4&w=540]
NASA has produced a number of visualisations of oceanographic and climatological data, among them this one showing sea surface currents, coloured according to their temperature. This one is subtle and slow-moving. Watch carefully. You can clearly see the equatorial currents, and the hectic eddies of the Agulhas current all down the east coast of Southern Africa.
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