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Where do diamonds form?

“Most natural diamonds form about 100 miles below Earth's surface under extreme heat and pressure.”

Reference: Gemological Institute of America (GIA)

What saturation of sulfur dioxide will cause people to cough

Sulfur dioxide is a colorless gas with a suffocating, choking odor. It is toxic to humans and concentrations as low as 8 ppm will produce coughing. Incredibly, in the Odyssey, Homer describes the burning of sulfur (formation of SO2) as a way that homes were 'fumigated'.