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This is a doomed colony of army ants. When on the move, the ants follow the pheromone trails left from those ahead. The scouts in this case threw a bit of a wobbler when they reached the pavement. The featureless concrete caused them to go in a circular route. All those following began walking the circle, which tightened up to the almost galaxy like vortex shown. Will they walk till they die?
Concrete also plays its part in the destruction of a large ant colony in the following video. The astounding network of underground tunnels and chambers is revealed on excavation of the concrete filled nest.
And here's the full ant documentary, fascinating -
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Unrelated to this post, below is an example of
eclectic science esoterica
Geissler tubes 1869
Geissler tubes 1869
"Electric discharge in rarefied gasses: 1.Discharge in Vapor of Alcohol. (2.3.4.5.Geissler's tubes enclosing rarefied gasses) 2.Shows Fluorescence of Sulphuret of Calcium, 4.Fluorescence of Uranium glass, 5.Shows Fluorescence of Sulphuret of Strontium, 6.Fluorescence of Uranium glass and Sulphate of Quinine"
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