A clue to why evolution might favour such a double-trigger mechanism may come from the other finding that women appear more susceptible than men to tactile manipulation.
In each case I heard that a handful of people got sick early and asked to leave, but most grumbled, had respiratory problems-and seemed to be okay later on.
IDDs still constitute a public health problem throughout urban areas in the Sudan and iodine deficiency appears to be the main etiological factor involved.
But several people seemed shaken by what they described as "the second tremor," when throngs of vandals looted stores and warehouses in the worst affected areas of the disaster zone.
Several moments went by, one of the big Jacks pawed at the ground with his hooves and another looked behind him, as if to check the rear for a surprise attack.