The highly-flammable and toxic gas killed two people and 35 others had to be treated at the Pemex facility in Deer Park.

A staff member had disappeared into the back to look, unsuccessfully, for the formula requested by the other dad. We were luckier: a member of our extended family had managed to secure the formula ...

Now researchers have documented wells releasing dangerous amounts of hydrogen sulfide gas. A cow stands next to a non-producing oil well in Caldwell County. Gas has been venting out of the well ...

Software like Excel can make this calculation easier. Variance is calculated by using the following formula: You can also use the formula above to calculate the variance in areas other than ...