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Where does "mad as a hatter" come from?

“The phrase "mad as a hatter" is linked to hatmakers who were poisoned by mercury used to make felt.”

Reference: Smithsonian Magazine

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'.

Which metal is liquid at room temperature?

Mercury is the only metal that's liquid at room temperature.

Fact about the prairie dog language

Prairie dogs, those little pups popping in and out of holes on vacant lots and rural rangeland, are talking up a storm. They have different "words" for tall human in yellow shirt, short human in green shirt, coyote, deer, red-tailed hawk and many other creatures.

Another fact

“The phrase "mad as a hatter" is linked to hatmakers who were poisoned by mercury used to make felt.”

More from this shelf

What saturation of sulfur dioxide will cause people to cough

Which metal is liquid at room temperature?

Fact about the prairie dog language