Scientists stumped by mysterious methane-packed foam making hog farms explode?
Scientists are baffled by an expanding foam
that is growing on manure pits and causing entire hog farms to
Six farms have blown up since 2009 - killing
thousands of animals - after methane trapped inside the unidentified foam caught
And there's no stopping it: the foam has now
started growing on one in four farms across the Midwest.
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