The guts of the present patent application (No. 206338) concern the mechanical and laser systems required to compensate for large, initial variations (as in head size) as well as smaller ones like temperature and head movements in order to create a reliable active alignement between the stereo images.

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The severe form of the disease, dengue haemorrhagic fever, involves a high temperature, head and muscle aches, internal bleeding and, at worst, circulatory failure.

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At the bottom of the Knotty Head hole, the 450-degree-Fahrenheit temperature and the pressure (2, 000 times atmospheric) would crush or melt most drilling tools.

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Last week the temperature dropped to seven below zero in the Twin Cities, which is one reason many Midwesterners head to Florida or Arizona for the winter.

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