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The room smelled like mop water and old sunshine—yesterday’s light trapped overnight in printer paper and dust, ready to get out and do crimes. I slid my shoulder against the door to pop it open because my hands were full of plastic wrap and a guilty-looking bag of potting soil with a cartoon fern smiling on the front like it didn’t know where it was going. The lights thunked on in segments—back row first, then the row above the lab sinks, then finally the bank above my desk as if the electricity had to climb the walls. The UNKNOWN meteorite blinked at me from its plastic casket. I lifted the usual sheet of paper off it like a magician revealing the rabbit and said, “Morning.” The rock stayed professional.
On the board I wrote:
CAN WE TERRAFORM MARS WITH STUFF FROM THE JANITOR’S CLOSET?
— Define “terraform.”
— Define “Mars.”
— Define “closet.”
— Safety: If the bottle has a skull on it, the answer is no.
Under that I drew a lopsided rectangle with a little dome and tiny stick figure waving a flag that said HI MOM because I am incapable of drawing a dome without also drawing a person in it.
I set the potting soil on the front counter next to the aquarium—forty gallons, glass, clean enough to put a fish back in if you were a forgiving fish. The aquarium had been through some things. We’d hatched brine shrimp in there in October, watched them swirl like living punctuation and then disappear under what I euphemistically called “structural neglect.” I scrubbed the glass last night while listening to a podcast about lichens because my search history is a cry for help.
I unrolled plastic wrap and tore off a yard. It clung to itself and then to me and then to the board like an affectionate jellyfish. The tape gun, which had never once behaved like a machine designed to help, yelped. I took a breath that tasted like dry erase and resolved not to cuss in front of the children.
The door banged open at full volume.
“Make way,” Luis announced, rolling in a dolly like a miniature moving company. Bungeed to its platform: another aquarium, this one smaller, sloshing with an inch of clean water. He had glued a plastic arch to a rock to make a “habitat feature.” A label made of masking tape read: ARES-1 BIOSPHERE . He’d drawn a tiny rover under it. The rover had feelings.
“Good morning,” I said. “Is that OSHA-certified?”
“It’s a closed system,” he said, which is the kind of thing you say before something opens itself.
Behind him: Emma, already tucking a pencil behind her ear like a conductor with a baton she can write with. Mia with her hoodie half-up, a determined knot to the drawstrings and a spray bottle in one hand like she’d been born with it. Malik with a grin and a roll of duct tape around his wrist like a bracelet. Leila quiet in his wake, black nails, small silver moons at her ears catching fluorescent and splitting it into patience.
“It’s Questions Day,” Malik said, already crossing to the board to read. He read, and a sound came out of him that was half gasp, half battle cry. “Mars? Closet? Terraform? We’re doing war crimes with mops.”
“No crimes,” I said. “Just adventures in scale.”
“Define ‘terraform,’” Emma said, on display because the words were right there and she had the instinct to grab the strongest brick first.
“Make a place less rude to us,” I said. “Move the average day from ‘death’ to ‘mild inconvenience’ without a pressure suit. Warm it, thicken the air, make water stick around in the liquid phase, get the chemistry off ‘knife fight’ and onto ‘picnic.’ That’s the dream. We will do it in a rectangle you can put on a rolling cart and then we will be insufferable about it for the rest of the period.”
“Define ‘Mars,’” Mia said, deadpan, and raised her spray bottle a little.
“Cold,” I said, listing the adjectives on my fingers. “Dry. Thin air your lungs would laugh at if they could. Mostly carbon dioxide, with a little nitrogen and argon like it wants to be fancy. No global magnetic field, so space weather gets frisky. Perchlorates in the dirt if you’re unlucky.” I pointed at the cabinet. “We are not doing perchlorates.”
“Define ‘closet,’” Leila said, softer, which made it land better. The word closet did a different work in her mouth, made of all the other things closets mean when you are twelve and have your own small secrets.
“The place at the end of the hall where hope and bleach live,” I said. “And Mr. Petersen, who knows more about this building than any of us, which is why we ask first and borrow second.”
On cue, someone in the hallway rammed a cart into a drinking fountain. The metal yelp vibrated through the cinderblock like an apology. I grabbed a clipboard with a list that read SCIENCE SHOPPING and a column for “approved” with boxes I could pretend had legal standing.
“All right, expedition team,” I said. “Here’s the scavenger list. Plastic sheeting. Trash bags. Duct tape. Mop bucket. Squeegee. A couple of those big syringes we use for refilling dispensers—clean. If we get desperate, we’ll steal a piece of cardboard and call it a heat shield. You will not touch bottles with skulls on them. You will not be lured by the siren song of ammonia. You will especially not introduce ammonia to bleach because then we all learn what evacuation means.”
Mia held my eye and nodded once, Safety Officer to Captain. We had an understanding: the class would do ambitious nonsense, and nothing would explode on purpose.
We moved as a unit. The hallway had its morning exhale going: lockers thudding, a late kid flip-flopping in untied shoes, the janitor’s cart creaking like a barge. Petersen himself—a man who could fix anything with a crescent wrench and regret—stood with a keyring the size of Saturn on his hip and a coffee cup that said WORLD’S OKAYEST GRANDPA.
“Petersen,” I said, bright as a nickel. “We come in peace and with signable release forms in our hearts.”
He looked at the rolling aquarium. He looked at the flock of seventh graders shaped like chaos. He looked at me.
“You’re the one with the rock,” he said, nodding toward our room like the meteorite had a union card.
“Yes,” I said. “And an impeccable safety record.”
“Except the time you made slime in the sink,” he said.
“Impeccable,” I repeated.
He sighed, a noise of profound municipal resignation, and swung the closet door open. Inside: the kingdom. Shelves of folded trash bags, glinting duct tape, cardboard, a fan with two blades missing that had survived three principals, stacks of paper towels like compressed prairie. The chemical shelf sat like a dragon hoard: gallon jugs with hazard diamonds and acronyms that make chemists nostalgic. Mia watched them the way a gun safety instructor watches a toddler walking toward a display case.
“Trash bags,” I said, plucking a box. “Tape. Bucket. Squeegee. Gloves.” I tossed nitrile like blackjack cards. “Those big syringes there—yes—that we use to refill soaps. Perfect. Also.” I pointed at a coil of clear tubing. “For science.”
Petersen handed me a roll of painter’s plastic drape as if he were surrendering a family heirloom. “Bring back what you don’t melt,” he said.
“We don’t melt infrastructure,” I said, and meant it with more fervor than I say most things.
Back in the room, we turned our loot into an intention. Luis’s ARES-1 went on my demo table near the window. The actual aquarium we’d convert into ARES-2 took the center station under the fume hood only because it felt ceremonial. I spread the painter’s plastic over the top and the stuff shivered like a pond skin. The duct tape screamed. My tape job looked like emergency bandaging on a soccer field.
Emma drafted a data sheet with columns for gas, light, pH indicator, temperature, leak status, notes. Her handwriting has a small engine in it. Malik popped a trash bag open and it whoomped like applause. Mia filled the mop bucket half with sink water and half with disapproval for how much got on the floor.
“Atmosphere,” I said. “We need carbon dioxide because Mars. We need some nitrogen because plants are fussy. We can steal nitrogen from air by not doing anything. For extra CO₂…” I held up a bottle of vinegar in one hand and a box of baking soda in the other. The class made the collective oooooh noise humans have made since cavemen first found citrus. “We will make a gentle volcano and pipe it in with this great piece of medical equipment.” I waved the syringe.
“I have yeast,” Luis said, blessedly on brand. He had a bag of granules that smell exactly like the inside of a warm bakery if the bakery went to science camp. “And sugar. Slow burn CO₂. For long-term strategy. Terraforming is not a one-and-done.”
“Yeast,” Emma said, scribbling, “metabolizes sugar anaerobically and produces ethanol and carbon dioxide. Proof: middle school dances smell like it.”
“Science is observation,” I said gravely.
We built: a two-liter bottle half full of warm water and sugar, a packet of yeast sprinkled on top like we were invoking a spirit. We fed a length of clear tubing through the cap and sealed it with hot glue (not from the closet, but from the drawer every classroom has that is ninety percent glue and ten percent broken dreams). The other end of the tube slid through our plastic membrane and into the aquarium, where it poked into a little dish of water to make friendly bubbles and also to let me visually confirm that I hadn’t built a CO₂ bomb.
Luis hovered over it like a parent at a first swim lesson. Tiny pearly spheres rose. He grinned. “Biosphere breathing,” he whispered.
“Now the rude version,” Malik said, measuring baking soda into a beaker like he was doing a line in a heist. “One-hit wonder.”
“Gently,” Mia said.
“Gently,” Malik repeated, which on him is like a tiger saying moo.
We put the baking soda in a flask with a sidearm (again, not a closet item, but the spirit of the assignment is thrift, not legalistic purity). I poured vinegar in slowly and we all leaned in as if the foam were a fortune teller about to say the word you didn’t want to hear. It foamed hard; the tube filled with a colorless thing that’s somehow a character to me—carbon dioxide: heavier than air, indifferent, reliable in its chemistry and in the way it ruins parties if you let it.
“Indicator,” Emma said. “So we can see it, even if we can’t.”
From the cabinet came bromothymol blue—BTB, the high school sea. It’s a pH indicator that tracks indirectly what carbon dioxide is doing because CO₂ in water makes acid in a tiny enraged way. In base it’s blue, in acid, yellow; in the middle, green like the kind of Jell-O described in church cookbooks with suspicious optimism.
I dripped BTB into a beaker of distilled water and held it up. Blue sky. I bubbled our CO₂ through with the syringe. It wisped yellow, then greener, then yellow-yellow like a traffic light too polite to turn red.
“Atmosphere achieved,” Malik said.
“Counterpoint,” I said, tapping the top of the aquarium with my knuckle. “We are also making a greenhouse. That’s heat. That goes hand-in-hand with atmosphere on Mars because you want to hold on to what little you get. We’re going to simulate greenhouse effect with plastic wrap and optimism. But note: Mars is farther out. Less sunlight. We’re under a star called Sylvania*. This is cheating. We cheat responsibly.”
Soil next. The bag tore and burped the smell of wet world. I poured a layer into the bottom of the ARES-2 tank. It had perlite flecks like little moons. I added playground sand from the bag by the door (for friction experiments that become footrest experiments on bad days). I mixed them with a gloved hand until it felt roughly like something you could convince a root to live in.
“Seed,” Luis said, and presented me a handful of thrift-store green: duckweed skimmed from the science lab’s old tank, a pothos clipping I’d been propagating in a jar because plants will forgive anything, a pinch of lawn from the soccer field I pretended I didn’t see him harvest. It had dirt under its nails like a kid.
We planted. If you can call pressing a pothos cutting into damp soil under a plastic tent planting. It looked like hope trapped in a weird office.
I sealed the top. The plastic drummed when I flicked it like a cheap tympani. The yeast bottle made its contentment fizz. The BTB in the little open cup inside the tank leaned yellow, acid breathing in. I tilted the blinds to dial the window light onto our mini-Mars.
“Name it,” I said.
“Ares-2,” Luis said immediately. “Ares-1 is the field unit.” He patted his rolling aquarium and it sloshed in solidarity.
“Expedition log, Ares-2 established at oh-nine-oh-four,” Emma intoned, deadpan enough to be comedy. “Initial atmospheric CO₂ production achieved by acid-bicarbonate reaction and biological respiration. pH shift observed via bromothymol blue to yellow state. Light engaged by God.”
“Define ‘terraform,’” Leila said again. She was looking at the plastic seam, at the bubble where the tape wrinkled, like that’s where meaning goes to escape.
“Make a place behave more like home,” I said. “Not for us in spacesuits. For us in shirts.”
“Which ‘us?’” she said.
I opened my mouth, closed it. The question curved inside the plastic and hit me in the throat. The yeast bubbled, oblivious. The indicator glowed cheerful urine-yellow. Malik was investigating the mop bucket like the bucket might confess secrets.
“We’ll…put a pin in that,” I said weakly. “Emma, add ‘ethics’ to the column.”
“Always my favorite variable,” Emma said, scribbling SHOULD with a three-line underline.
We watched. Watching is the part of science that feels like prayer if you’re built a certain way. The BTB stayed yellow. It had no reason not to. The yeast huffed and bubbled with the infinite confidence of fungus. The pothos leaf looked too green, like it had been over-saturated by a phone camera. The air under the plastic beaded moisture and the droplets crawled down like transparent snails to return to the soil. A little water cycle woke up. It made a sound like soft applause from a very shy audience.
“Temperature?” Mia said.
Twenty-one C at the start. Twenty-two now. Twenty-two-point-five. The plastic trap worked. A tiny greenhouse is an eager greenhouse. We’d keep it modest; I’d had enough fire safety meetings to know when to stop at cozy.
We ate the time with jokes and small tasks. Malik labeled the yeast bottle FERMENTATION STATION because rhyme is a valid pedagogical tool. Luis adjusted the bubble stone in the water dish with a pipette like he was tuning a car. Emma set a timer for fifteen minutes and kept her pencil as metronome. Mia wrote a neatly lettered warning card and taped it by the chemical shelf: DO NOT TOUCH BLEACH OR AMMONIA. She underlined OR. Twice. Then she went to the sink and washed her hands like a surgeon.
I took a breath of the room again and tasted vinegar, plastic, soil, children, the leftover coffee on my tongue. I looked at UNKNOWN on the desk and the meteorite looked right back, unchanged by our small damp dome. Space—real space—doesn’t care. It’s the freedom and the ache of it. You talk to a rock and it gives you silence so perfect it becomes a mirror.
“Okay,” Emma said, when the timer dinged with the sound of a very polite xylophone. “BTB color check.”
Leila leaned over the tank and cupped her hands to make a cave around the indicator cup. With her hands making shade, the yellow slid toward green—not because of the shade, because time had done a thing. Plants eat carbon dioxide for breakfast if you give them light and some minerals and the right kind of water. They give back oxygen and smugness.
“It’s greener,” she said. She didn’t sound happy. She sounded like something had been proven that she hadn’t bet against, exactly, but hadn’t wanted to see solved.
“Photosynthesis,” Malik said, like a magician calling his own trick. “Boom.”
“Soft boom,” Mia corrected.
We turned the cup gently with a gloved finger and the color deepened a little more. Green the way a pond looks when it’s contemplating whether to be August.
“We’re doing it,” Luis said. His smile was the kind you can hang hats on. “Closed loop. Terraforming.”
“Jarforming,” I said. “But I’ll give you the first two syllables.”
“Scaling is a nightmare,” Emma murmured as she wrote. “Square-cube, resource curves, energetics. But this is…not nothing.”
“No,” I said. “It’s not nothing. It’s a thing you can look at with your entire face. Which matters.”
The door cracked open and Ms. Olson put her head in. She has a voice like a cello and the schedule of a war general. “Whatever you’re cooking,” she said, “smells like salad dressing and happiness.”
“We’re terraforming Mars with vinegar,” Malik said.
“Of course you are,” she said amicably. “Please don’t make me fill out a form.”
She left, and the room hummed around our aquarium like a chorus. The yeast bottle bumped like a little heartbeat. The indicator tipped further into green, then skated along a line between already and not yet. The plastic breathed lightly with pressure changes and the distant white noise of the vents. A fruit fly showed up from wherever fruit flies commute and bounced off the plastic wrap, confused, which seems like their baseline.
“This is nothing like Mars,” Leila said. It wasn’t a complaint. It was the naked observation that makes my job worth anything. She was still looking at the seam, at the little trapped air bubbles along the tape, at the difference between the map and the country.
“It’s nothing like Mars,” I agreed. “Mars has no pressure to speak of. We have a whole Earth’s worth under that plastic. Mars is cold enough to make this water freeze and then leave. Our room HVAC throws a tantrum if it dips under twenty. Mars’s soil is mean with chemicals that would like to eat the insides of your lungs. We gave ours fertilizer and said please. And then there’s time. The planet is old. We are in the minutes.”
“So it’s fake,” Malik said, toeing the bottom of the lab bench in a rhythm that wants to be drums.
“It’s a model,” Emma said automatically, which is the gentle correction you learn from a thousand science fair trifold displays. “All models are wrong. Some are useful.”
“It shows direction,” I said. “You push on a system and the system moves, and if you’re lucky it moves where you were aiming. The difference between making a jar breathe and making a planet breathe is a few orders of magnitude and all of politics.”
“And ethics,” Emma added, tapping the column where SHOULD sat like a judge.
“Should we?” Leila said. There it was. The question that had been standing quietly by the window, watching us. “If we can.”
The yeast bubbled again. I watched a tiny CO₂ pearl form, rise, pop. Pothos leaves reflect light like they know secrets. Outside the window a gull slid past, tilted, went on with its wet day. The meteorite sat.
“We finish our jar first,” I said, which was not an answer but a way of staying in the room. “We learn what breaks and who gets burned. We learn to do it without melting our tape or our trust. Then we try a bigger jar. Then we ask people who aren’t us. Then, maybe, after we prove we can be kind to a place and to each other for longer than an experiment, we knock on a planet’s door and ask if we can tidy up.”
“That was a lot of words to say ‘I don’t know,’” Malik said, but not unkindly.
“I don’t know,” I agreed. “But I want to. That counts.”
The timer dinged again. We checked color. Green, pushing blue at the edges like the ocean thinking about sky. On a long enough timeline, especially with that pothos, we’d edge it toward base, then breathe into the tank and pull it back toward acid, then watch it settle around a compromise. The water cycle ticked. A drop fell. Another rose. Inside the plastic our tiny weather had decided to exist.
Mia wrote measurements with the care of a paramedic charting vitals. Emma seeded the data sheet with arrows and notes and little stars that meant “talk about this later.” Luis drew a tiny flag and a less tiny dome and wrote WE LIVE HERE on the dome with a smiley. Malik put his face right up to the plastic and fogged it on purpose and laughed at the fog like it was a prank. Leila stared through the tank to where the meteorite sat and looked like she was listening for a sound you only hear under water.
The bell for the half-period rang, a lower, lazier tone than the top-of-the-hour bell. It was the sound of a school changing gears. The hallway went briefly stampede. Somewhere Mr. Kelley’s voice did the exactly two-parts patient one-part necessary thing good coaches do when teenagers are about to aim a car at parallel lines.
“All right,” I said. “We stabilize the rig. We mark everything ‘Do Not Touch—Science’ which will work until it doesn’t. We make signs. We clean up vinegar evidence so I don’t get emails about smells. Then you write one paragraph each in your best ‘convince a senator’ voice about why this jar matters.”
Groans. Real ones. Acceptable ones.
We did the tidy: we weighted the plastic edges with binder clips because binder clips are proof the universe wants us to succeed. We taped the yeast bottle to the side of the tank like an IV. We left the indicator cup in place with a Post-it labeled “DO NOT DRINK THIS UNLESS YOU WANT TO LIVE IN THE NURSE’S OFFICE.” We set Ares-1 on the window ledge as a satellite cousin. We mopped the place where the mop bucket had decided it wanted to experience outside.
Before they sat, I took one more sticky note and wrote WORK IN PROGRESS in my blocky moving-car font. I stuck it next to UNKNOWN on the meteorite case. The rock did not mind being captioned.
“Homework,” I said. “Find one thing at home that gets better if you put a clear cover on it and one thing that gets worse. Observe. Plants under jars, bread in bags, people in helmets, feelings in mouths. Explain in a way your grandmother would understand. Bonus points if your grandmother is scientifically inclined and gives you notes.”
Malik’s hand popped up before the last word.
“If this works,” he said, chin out, eyes bright, “can we put Mr. Kelley’s cones inside it and see if they grow into cars?”
I let myself laugh. It helps the learning get in. “We’ll ask the cones how they feel about being domesticated.”
The clock’s minute hand jerked to the vertical. The bell rang its spine note. Bodies gathered their packs and grumbles and the little muttered jokes that make a day less sharp. They flowed out with a draft that tugged our plastic just enough to make it breathe. Ares-2 exhaled. It inhaled. It kept existing. The yeast would keep bubbling. The pothos would keep being the stubborn little engine it always is.
The room went from orchestra to rehearsal piano. Quiet with memory.
I stood by the tank and watched the BTB think about being blue. The meteorite sat under UNKNOWN and WORK IN PROGRESS like a judge who had seen everything. I tapped the plastic. It boomed dully, like a heart heard from the outside. The drop on the underside decided to let go and slid along the film, growing, catching other drops, becoming one, then two again, then gone into soil like it had an appointment there.
Could we terraform Mars with stuff from the janitor’s closet? No. Not really. Not the big thing, the true and massive thing. But we could terraform a jar. We could change a room. We could teach a handful of very human animals to look at a plastic seam and see both the trick and the truth, and then ask the right question about it. That felt like a start. Most good science is just a lot of good starts with your hands on them.
The door opened without knocking. Second period arrived like weather. The river came back. I pulled a new marker from the bin, uncapped it, and wrote one more line under the question on the board:
— Begin where your fingers reach.
Then I turned to the room and said, “Okay. We’re making a planet.”