Radioactive isotopes accumulate in milk after they spread through the atmosphere, fall to earth in rain or dust, and settle on vegetation, where they are ingested by grazing cattle.

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The Pocket PC-based PPT 2700 series, for instance, can withstand multiple drops from a height of four feet to a concrete floor, and it is sealed against rain and dust.

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All three meet military specification 810G for dust, shock, vibration, extreme temperatures, blowing rain and immersion.

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The lowest logs were now buried in the earth, as if returning to their birthplace, and from these logs, from the very lowest part of the hut, were growing two new weak branches, which would one day turn into mighty oaks and eat with their roots the dust of this dwelling that had been exhausted by the wind, the rain, and the human race.

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It meets the highest standards of resistance to dust, sand, shock, vibrations, low pressure, high and low temperature, rain and long-term moisture.

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Curiously, the previous-generation product wasn't rain-proof, but that's been resolved now -- a new water- and dust-resistant housing is designed to let water flow through the eyepieces without accumulation.

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