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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'.”

Reference: http://mattson.creighton.edu/SO2/SO2_Info.html

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Random fact about renewable energy

If your family could use only renewable energy for all your energy needs, you could help reduce the amount of emissions in the air each year by 20,000 pounds of carbon dioxide, 70 pounds of sulfur dioxide and 50 pounds of nitrogen oxide.

Who created the periodic table of elements?

Russian chemist Dmitri Mendeleev published his periodic table in 1869. He left gaps for elements that had not been discovered yet and correctly predicted their properties.

Interesting fact about humans

Humans are the only primates that don't have pigment in the palms

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