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A particular challenge is the great disparities in participation rates between countries . According to the researchers , the plasma current that forms a coronal loop is probably caused by uneven heating at the bases of the loop , with plasma racing from the hotter end to the cooler end . Not a single cloud was passing over the deep blue of the heavens , to vary their boundless transparency , or shadow for a moment the gleaming ocean which they spanned . A common complaint is that condoms interfere with sex play . A secondary purpose is to aid in the delivery of literacy materials to the at risk children enrolled in area preschools and to help their caregivers achieve a high level of optimal use of these literacy materials .