Template:Are You Sure/December 28

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A Hazmatterhorn is a mountain of hazardous materials. Although derived from the word Matterhorn, the term Hazmatterhorn is applicable to any such mountain.

• ... that Francesco Maria Grimaldi was the first to make accurate observations on the diffraction of light (although by some accounts Leonardo da Vinci had earlier noted it), and coined the word 'diffraction'?
• ... ?
• ... ?

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