Freak mystery foam threatens hog farmers.

Hog farmers in the American Midwest are facing a weird challenge from a mystery foam of unknown origin that grows out of hog manure pits and can explode catastrophically.

Factory farming is getting so extreme and weird that toxic foam is starting to emerge from hog manure pits in 25% of farms, growing in some cases four feet high. The foam captures flammable gas, and can explode if ignited.

One explosion in September killed 1,500 pigs.

The likely cause is something strange in the pig's diet that creates a Frankenstein microbe population in their feces.
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