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What do bobtail squids, comb jellies, and lanternsharks have in common? Along with many other living things, these marine creatures glow in the dark. But why? In terms of economies, what does bioluminescence do for an animal? For some, it helps them attract mates—or meals. For vampire squids, it’s actually a defense mechanism; instead of squirting ink like other cephalopods, they squirt glowing mucus to distract predators. In terms of how creatures glow in the dark, there are multiple answers. But we’ll get to that in a minute. For now, why is an important question, one that leads to our first exercise.

Writing Prompt 1 | Facts as Fantasy Seeds

I’ve personally found that some of my best fiction writing germinates from simple facts. For example:

“Soldiers in the trenches sometimes used glowworms to read maps without drawing dangerous attention to themselves” (35)

GLOW: The WILD WONDERS OF BIOLUMINESCENCE BY JENNIFER N. R. SMITH

What ingenuity! This cool fact is a perfect seed for a fictional premise.

Come up with a glowing fantasy creature. Why does it glow? Choose one of the reasons listed above, or invent your own. How has this creature influenced the world in which it lives? What inventions has this living-glow technology inspired? How might your glowing creature factor into the plot of your book? What problems might bioluminescent life forces be able to solve – in what low-light situations might they ethically (or unethically, if you’re writing a dystopian novel) be put to use? Brainstorm for at least 15 minutes, taking down every writerly thought you have. For extra credit, sketch your creature.

Adapt the Exercise for Classroom Use
What are your students’ favorite animals and why? Use the bioluminescence prompt above with students as-is, or let them choose their own found fact to work with.

Writing Prompt 2 | What’s the Difference?

Again from Smith’s book GLOW, when reading about bioluminescence, I noticed two related words: biofluorescence and biophosphorescence. They all have to do with glowing in the dark, but the differences are scientifically significant. Let’s take a look:

1. Fireflies and glow sticks are both examples of luminescence; they work due to chemical reactions. The other two don’t create light through chemical reactions, but capture light from other sources.)
2. Fluorescent materials absorb non-visible light and convert it into visible light, emitting no afterglow. Sapphires, amber, pearls, and other gemstones are prime examples of fluorescent materials because they glow under UV light, but stop glowing immediately when the light is turned off. Biofluorescent organisms include polka-dot tree frogs, hawksbill sea turtles, and scorpions.
3. Phosphorescent materials store the light they absorb, emitting it more slowly. Because their glow lasts for a while after their initial exposure to a light source, glow-in-the-dark stars are an example of phosphorescence. The study of biophosphorescence—phosphorescence in living organisms—is relatively new, with reports of such in rice, starch, and millipedes.

All this to say, paying attention to words’ definitions can make a huge difference. Before beginning, select three to five sentences from a work-in-progress. They could be from an article, a novel, an essay. Whatever you (or your students, if you’re using this as a classroom activity) are working on.

This second writing exercise is inspired by Several Short Sentences about Writing by Verlyn Klinkenborg. He wrote that to be a writer,

“You need an ever-growing vocabulary—

and with it the awareness

that most words carry several meanings.

You need to look up even familiar words

every time you have a doubt

and especially

when you don’t have a doubt.

That is, very often.

That is, every time you write” (58).

With this in mind, look up the definitions of every noun, verb, and adjective in your sentences and revise each sentence in at least two different ways. Here are some tips:

• Wherever there’s an -ly adverb, consider upgrading your verb.
• Consider what each sentence denotes (literally means) vs. what it connotes (implies). Is it doing the work you intend? Browse a thesaurus to find other words that may capture your intended meaning(s) more accurately.
• Moving from known information to new information is one way to ensure that you don’t lose readers. Could rearranging your sentences’ phrases clarify your meaning(s)?
• Consider how the revised sentences compare with the originals. Did you learn anything new during this process?

If you try these exercises, comment below about how they worked for you, or hop over to my website and contact me.

Best,

Stephanie Jackson

A nature-loving creative, Stephanie Jackson writes poems, articles, picture books, middle-grade novels, and more. Her nonfiction has been published in Cricket magazine and her poems have been published in The Dirigible Balloon and various literary journals including Touchstones, where she’s been a contributing poetry editor. Professional affiliations include the Society of Children’s Book Writers and Illustrators (SCBWI) and The Authors Guild. In 2025, she’s graduating from Utah Valley University with her English degree, emphasis in creative writing. She interacts with the kidlit community on Twitter as @canoesandcosmos, and you can read more at StephanieWritesforKids.com.