An example of metaphor used in science writing,
"The superheavy elements – the final 15, element 104 and beyond – have only ever existed in quantities so small they can't be seen by the human eye and can last for less than a second. … They are chemistry's unicorns.
…You can't hold a superheavy element in your hand. Chances are, as you read this, many of these elements do not exist anywhere in the universe. They are chemical unicorns.
But they are unicorns we know exist."
Kit Chapman, (2019). Superheavy. Making and breaking the periodic table. Bloomsbury Sigma.
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Read about examples of science metaphors
Many examples of science metaphors are listed in 'Creative comparisons: Making science familiar through language. An illustrative catalogue of figurative comparisons and analogies for science concepts'. Free Download.