Teams have found a number of open spaces and air pockets in the WTC's basement areas, and they hope they will find survivors in similar areas.

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Unlike with other pen-enabled tablets, where you might see air pockets in between the screen layers, this actually comes close to matching what it feels like to write on paper.

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And, at this point, the tiny, dry insulin particles had such a large surface area relative to their mass that, like popcorn or flour, they poured unevenly, leaving air pockets and inconsistent doses.

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As many as 15 percent of the 5, 000 previously approved welds in the reactor's auxiliary plumbing, containment dome and spent-fuel cooling systems were X-rayed and found to be defective due to air pockets, poor soldiering and heat damage.

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It may sound esoteric, but he hopes that understanding the conditions needed for particular sorts of flake to form will enable meteorologists to give out accurate warnings of air-pockets that pilots should avoid in order to prevent their aircraft icing up.

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Yet this has not presented a problem until recently, as supercomputers came out of national laboratory blockhouses, into massive air-conditioned buildings in corporate headquarters, later onto millions of desktops, and now into millions more pockets in mobile devices.

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