This article from the Columbus Dispatch reminded us that natural gas migration is often blamed on oil and gas operators, ignoring the fact that this type of migration occurs naturally in many producing regions: "Naturally occurring natural gas led to Thursday's explosion at Darbydale Elementary School, which is to remain closed for the rest of this week. South-Western officials expected to open the school Wednesday, but inspectors discovered today that natural gas seeping from underneath the building caused the fire in the boiler room."