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Why does water have such unusual properties?

“Hydrogen bonds between water molecules give water many of its unusual properties, like its high boiling point and the way ice floats.”

Reference: Royal Society of Chemistry

More water facts

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'.