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| Source - xkcd |
See, the ancient Greeks believed that the world was composed of four elements: Earth, Air, Fire, and Water.
Here Randall Munroe has classified the modern elements on the periodic table into airs (elements that are gaseous at room temperature), waters (elements that are liquid at room temperature - Br and Hg), earth (solids at room temperature), and fire (the radioactive elements).
Not a lot to figure out there, though there is still an explainxkcd article on it.
Oh, and congratulations if you figured out why I posted this today.
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