The fifth essence
More than 2,000 years ago, Aristotle proposed adding a new substance to the four elements of earth, air, fire, and water--quintessence. Here, there is overwhelming evidence that more than 90 percent of the universe is made up of a mysterious …
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the long version
More than 2,000 years ago, Aristotle proposed adding a new substance to the four elements of earth, air, fire, and water--quintessence. Here, there is overwhelming evidence that more than 90 percent of the universe is made up of a mysterious form of matter. Illustrated.
Margaret's verdict
"More than 2,000 years ago, Aristotle proposed adding a new substance to the four elements of earth, air, fire, and water--quintessence. Here, there is overwhelming evidence that more than 90 …"
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