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I got to school early to lay down mats. It felt like staging a low-budget heist—rubber squares dragged from the PE closet, a coil of rope over one shoulder, a kitchen scale under the other arm, all of it scraping and squeaking and smelling like old gym class and solvent. I slid my hip into the door to pop it open because my hands were occupied with making bad ideas less dangerous. The lights did their two-step flicker and then consented to be day. The room inhaled. Dry-erase ghosts greeted me from the board. The UNKNOWN meteorite on my desk sat in its plastic box with the patience of a saint.
I lifted the paper off the rock. “Morning,” I told it, like it was a colleague who never takes leave. The label NO LESS THAN NOTHING (a sticky note I’d stuck there on vacuum day) hung a little crooked. I straightened it and, for symmetry my brain insisted on, added a new one under the case in my blocky moving-bus handwriting: HOLD FAST .
The board got the question:
IF GRAVITY TURNED OFF FOR TEN SECONDS, WHAT SHOULD WE DO FIRST?
— Invent the plan. Then invent the demo.
— Safety: mats down, goggles on, no parkour on chairs, Malik.
— Sub-questions: Rotation? Air? What’s a floor good for?
I underlined “first” because it’s the only word that matters when something’s about to go wrong and you have exactly ten heartbeats to decide who you are.
Today’s props sprawled across my counters like a yard sale for Newton: a slinky coiled like a sleeping metal snake; a clear plastic cup with three thumbtack holes in the side near the bottom; duct tape (of course); a tuning fork; a spring scale; two bathroom scales liberated from the gym; a shoelace with knots at measured intervals; a cheap accelerometer stuck to an Arduino that I keep meaning to program better; a glass of water sweating quietly; a plastic bin labeled MATS in permanent marker so old it looked like a fossil; a long-handled broom; and a leftover marshmallow because every day threatens to be marshmallow day.
I hung the spring scale from the edge of the ceiling track (the one the projector pretends is a support beam) and clipped a meter stick to it so it dangled in the aisle like a ridiculous sword. I weighed my coffee mug on one bathroom scale and my soul on the other. The mug came up 346 grams including regret. The soul refused to calibrate.
Footsteps and voices rose in the hallway, the corridor river rehearsing its flood. The door banged open with that cheerful violence only twelve-year-olds achieve.
“Mr. Grace!” Malik announced, half entering, half detouring to take in the mats like he’d found a trampoline in a church. He locked eyes on the slinky. His grin went feral. “Today’s the day I join the ceiling.”
“Today’s the day you don’t,” I said. “Today’s the day we write a safety plan for an imaginary catastrophe and then fake it in small ways.”
Mia came in behind him, spray bottle in hand, hoodie sleeves rolled up with the grim efficiency of a nurse who has seen things. She read the board, then me, then the mats. “We need corner protection,” she said, like hello was implied. She moved to the counter and laid out goggles in rows, lenses up, like tiny helmets in a toy armory.
Emma ghosted in with her pencil already tucked behind her ear. She paused to look at the spring scale rig and said, “Apparent weight,” not like a guess but like a diagnosis. She took the seat nearest the board, drew a table with neat columns, and wrote at the top: TEN-SECOND PLAN (DRAFT) .
Luis rolled a cart with the swagger of a street vendor. On it: a shoebox with air holes, a small bucket, a plastic takeaway container, and, arranged like a family portrait, the ARES-2 aquarium from last week. The duckweed had claimed the surface like soft green confetti. He set the cart by the window with ceremony and patted the plexiglass. “Control group,” he said solemnly.
Leila came last as usual, silent as the weather changing, silver moons at her ears catching the overhead glare and alchemizing it into something soft. She read our question with a little tilt of the head that said: not just physics. Then she sat by the window, hands folded on her notebook. When she writes the date, she does it neatly enough to make time feel honored.
The bell rang its bone note. The room’s noise folded itself into attention.
“All right,” I said, clapping once—my personal thunderclap. “Ten seconds without gravity. Ten seconds of us, the floor, the air, and everything you didn’t secure last night, deciding what they are when they don’t have to be anchored. What do we do first?”
Malik’s hand shot up like a bottle rocket and then he didn’t wait. “Push off hard, get midair, do flips, high-five the ceiling fan, kiss destiny.”
“No,” Mia said, flat as a gavel. She stood. “We get low. We hook something. We cover heads. We become less thrown.”
“Become less thrown,” I repeated, because it was perfect. “Okay. Two approaches. Mayhem. Safety. Both are data. But first, let’s get specific about our make-believe.”
I grabbed the marker. It squeaked on the board in that way that always feels like nails but for science. I drew Earth in one corner, a stick figure of me (with hair more generous than reality) on a line labeled “San Francisco-ish Latitude.”
“Let’s be nerds,” I said. “Gravity turns off. Rotation keeps going. That means the centripetal tug that keeps us circling with the Earth isn’t there. So we go in a straight line for ten seconds while the planet curves away under us. How far do we drift up? Roughly.”
Emma’s pencil hovered. Mia crossed her arms and nodded because risk assessment loves numbers.
“Angular speed of Earth*,” I said, writing as I talked because anchoring math in motion helps. “One rotation per day. That’s 2π radians in eighty-six thousand four hundred seconds.” I wrote: ω = 2π/86400 s⁻¹. “That’s about 7.27 times ten to the minus five per second. Square it. Seven point two seven times ten to the minus five squared… that’s fifty-two point nine times ten to the minus ten, call it 5.29×10⁻⁹.”
Malik made the universal tween noise for “math feels like homework.” I ignored it kindly. Maths here is strictly for me (although those kids understand far more than we give them credit for).
“Multiply by Earth’s radius,” I said, “six point three seven million meters.” I wrote R = 6.37×10⁶ m. “So ω²R ≈ (5.29×10⁻⁹) × (6.37×10⁶) = 5.29×6.37×10⁻³.” I did the product out loud, digit by digit: “Five point two nine times six is thirty-one point seven four; plus five point two nine times zero point three seven is one point nine five seven three; add gives thirty-three point six nine seven three.” I rounded with teenage mercy. “Call it thirty-three point seven times ten to the minus three: 0.0337 meters per second squared—at the equator.”
Emma wrote 0.0337 m/s² neatly, and under it, φ. I nodded.
“We’re not at the equator,” I said, tapping our stick-figure in the Bay Area. “We’re at latitude thirty-eight-ish. Speed here is ωR cosφ. Acceleration is ω²R cos²φ. Cos thirty-eight is about zero point seventy nine; square it, about zero point sixty two.” I wrote cos²φ ≈ 0.62. “Multiply: zero point zero three three seven times zero point six two gives about zero point zero two zero nine. That’s our outward ‘let-go’ acceleration.”
Mia murmured, “Two point one centimeters per second squared,” because she writes things in units that live in her bones.
“Half a times t squared gives displacement,” I said, drawing a little parabola like a shrug. “t is ten seconds. Square it, one hundred. Half of two point one centimeters times one hundred is one point zero-five.” I wrote s ≈ 1.05 m and underlined it with a flourish. “So if you do nothing and gravity takes a coffee break, you drift up a little over a meter relative to the floor in ten seconds, because the floor keeps curving with the planet, and you go straight. Plus whatever you kick off with. Plus whatever the air does, which is…complicated.”
“Complicated how?” Malik said, which proves that any joke boy can turn into a scientist if you give him a hook.
“Air loses weight too,” I said. “Pressure gradient that keeps it puddled around Earth softens. For ten seconds, it’s confused. But inertia is king in short windows. Mostly, your danger is… floating into things that didn’t get the memo and then falling when gravity clocks back in. Also flying stuff. Also water.”
“Step one,” Mia said, making her own list. “Down. Hook. Cover.”
“Step one,” Malik said, grinning. “Up. Kick. Yell.”
“You’re both useful,” I said. “Let’s test small truths before we write big rules. Demo one: fake weightlessness.”
I held up the cup with holes in the side. It dribbled onto the sink with that tidy little stream. “Gravity on: leaks. Gravity off, aka everything falling together: no relative motion, no leak.” I stood on a stool—Mia’s eyes sharpened; I nodded at her; she stood with the spray bottle like law—and held the cup out over the mat. “Ready to catch?”
Luis stepped in with the reflexes of a kid who has dropped expensive things. “Always.”
“Three,” I said. I tilted the cup; water streamed. “Two.” I set the cup over the mat. “One.” I let go.
The cup fell. For the heartbeat it took to move, the water stopped streaming. It hung with the cup like glass had become glue. The class made the oooo noise humans make when the world lines up with the picture in their heads and also looks like a trick. The cup hit the mat and exploded into a splash and laughter. Water felt like wet relief on my ankles.
“Free-fall equals local pretend space,” I said. “Ten seconds would be…longer than a cup drop. But you get the idea.”
“Slinky,” Emma said, already reaching. Some people keep checklists in their chests. Hers has slinky on it.
We stood the slinky on the desk, stretched tall. I held the top. Malik aimed his phone to take slow-mo because we are all scientists now. Mia readied the spray bottle because nothing says safety like holding a bottle that makes things wetter.
I let go. The top fell. The bottom stayed frozen for a breath-dagger of time. Then the compression wave reached it, and it surrendered to down in one clean decision. The class oooo’d again, quieter, like a prayer that didn’t know if it was needed.
“The bottom waits,” I said. “It doesn’t know it should move until the signal arrives. Ten seconds of no gravity everywhere isn’t this. But there will be places and times where the news isn’t instantaneous. Shelves might decide late. Elevators might do weird ballet. Don’t be under or on things that wait to learn.”
Mia’s list got a new line: Avoid shelves. Avoid doors. Avoid crowds. She underlined avoid with three calm strokes.
“Scale,” I said, because showing beats telling. I put the bathroom scale on the mat, stepped on it, and announced to the room my sins. The numbers bounced and settled. “Okay. My apparent weight is… never mind. Mia, yank the rope.”
We had tied the handle of the scale to a length of rope that ran over a high pipe and down to Mia’s hands. She pulled up hard, still on the floor, giving my center-of-mass a quick skyward nudge. The scale dipped towards zero and then spiked as my feet tried to leave without me. The kids gasped and then laughed because nothing is funnier than the teacher almost falling.
“Apparent weightlessness,” I said. “If the floor accelerates down as fast as you do, the scale reads nothing. If gravity turns off, everything becomes an elevator going… nowhere. For ten seconds, your weight is lies and your inertia is truth.”
“Truth is rude,” Malik said, massaging his phone footage like a producer of truth TV.
“Mayhem plan,” I said, because he deserved his turn. “Malik, sell us your vision. Ten seconds. What’s the first thing you do?”
He didn’t stand on a chair because he’s not an idiot; he stood on a mat and used his hands like arguments. “Okay. Ten seconds. I leap toward the ceiling,” he said, pointing up, like his finger could draw a ten-second arc for him to ride. “I do a flip—” he mimed something between a prayer and a windmill “—and at nine seconds I aim down so I land like a hero when gravity comes back.”
“And if you miscount?” Mia said, immediate.
“Then I land like not a hero,” he said, and grinned with all his teeth.
“Also,” Emma added, “if you push off the floor at two meters per second—which is generous—you get to four meters up if you ignore air and if you could. Our ceiling is maybe three. There’s a fan. There are lights. There is your face.”
“Counterproposal,” Mia said. She had already drawn a rushed floor plan of the room. She circled SAFE areas in green highlighter and scratched big red X’s over the periodic-table wall because those cabinets are top-heavy. “Step one: Drop to knees, hands over head. Step two: Hook a table leg. Step three: Keep your mouth closed so you don’t bite your tongue when you fall. Step four: count with the nearest adult because counting together keeps people from screaming.”
“That last one is very proven,” I said. “NASA invented counting for exactly that reason.”
Luis raised a hand halfway, a flag not fully committed. “Counter-counterproposal,” he said. “Go to the doorway and hook the jamb. Because if the floor curves away from us and we go straight, the wall will meet us, and we can brace.”
“Only if you are already there,” Mia said. “Running during no gravity is… swimming without water.”
“Also,” I said, “doors swing. Handles can clock you. But the principle is solid: anchor to big things.”
I drew two columns on the board: MAYHEM and SAFETY . Under MAYHEM: “Jump,” “Ceiling high-five,” “Slow-mo selfie,” “Float snacks from vending machine.” Under SAFETY: “Down, hook, cover,” “Away from shelves & glass,” “Count out loud,” “Cap liquids / kill flames,” “Stay belted if in car.”
“Cars?” Malik said, energized by a new danger. “What happens to cars?”
“Seatbelts save you from being mayonnaise,” I said. “If gravity turned off while you’re driving, your tires would stop pushing the road. You and the car would continue in a straight line. Braking wouldn’t couple you to pavement. The best move is… do nothing dramatic. Stay belted. Hands on wheel so you don’t collect finger injuries when gravity returns.”
Emma added DO NOT OPEN DOOR and underlined it like she was the law.
Leila raised her hand without raising it—just a glance that asked permission. “What should we do first,” she said, “if we’re outside?”
“Best ground you can find,” Mia answered, before I could. “Grass, not concrete, no under trees, but maybe brace a tree trunk if no wind. Spread out so you don’t become a pile later.”
“Breathe out,” Leila said, like she was checking the edges. “Or in?”
“Either,” I said. “Your lungs don’t care if gravity’s over there being absent. Air still moves because you move it. Ten seconds is not enough to boil your blood. You are not divers.”
She nodded, tiny, and wrote something I couldn’t see, and I wanted to because every once in a while her notes feel like the draft of a law I’d sign without reading.
“Okay,” I said. “We have enough opinions to make a poster and enough curiosity to wreck a room. We will settle for the first. Then one more demo, then we codify the Ten-Second Plan, laminate it, and never use it.”
We made the poster. Emma wrote the title in block letters I envied: TEN-SECOND GRAVITY OUTAGE PROTOCOL . Mia dictated: “1) Down, hook, cover. 2) Count together. 3) Cap, kill, close: flames off, lids on, doors pulled shut if safe. 4) Avoid overheads. 5) Stay put. 6) After: heads on a swivel. Check people, then windows, then water.”
I wrote the list again next to the door where posters go to become furniture. Luis drew a tiny person hugging a table leg and gave the person hero eyebrows. Malik added a doodle of himself high-fiving the ceiling and then, after Mia looked at him, drew a big red circle-slash over his own doodle and wrote, NOT TODAY .
“One more demonstration,” I said. “The broom, the scale, and your trust issues.”
I laid the broom across two desks, stuck the spring scale on its midpoint, hung a weight (my coffee mug, half-drunk) from the scale, and then lifted the entire rig two centimeters and let it fall together onto the mat. For the hair’s breadth of the fall, the spring scale read zero. When the broom caught the mat, the scale spiked to a number that would break mugs if this weren’t a classroom and if we weren’t the luckiest species to have invented foam.
“That spike,” I said. “That’s the part when gravity comes back and we all become mugs briefly. Do not be a mug. Be a thing that has prepared itself not to be under other things.”
“Clocks,” Emma said, writing. “We need a clock.”
“I am the clock,” I said, and realized I meant it, which is an odd feeling for a person who has mostly felt like a metronome that drinks coffee.
We rehearsed. Because practicing is how panic learns to do what you want. I pointed at the poster. I counted: “Three—two—one—gravity off.” Everyone dropped in a choreography that wasn’t pretty but was sincere. Hands went to heads. Arms hooked table legs. The room became a low sea of elbows and bravery. I walked between islands, checking like a lifeguard. The room made that held-breath sound I have learned to love.
“Three—two—one—gravity on.” They stayed a second because trust takes longer to return than fear. Then they sat up, laughing the way animals laugh when their bodies tell them they did well at being alive.
Leila, still on her knees, looked up at me. “What’s the very first thing you do,” she asked quietly, as if there was a right answer and it would matter later. “If it ever…wasn’t a drill.”
I thought. I looked at the meteorite because it’s my trick when I need a second. Rocks don’t coach you, but they don’t rush you either. The HOLD FAST note looked silly and true.
“Count,” I said. “And then check you. Then check the person nearest. Then we count again. Counting is glue. Voices are bridges.”
She nodded like she’d expected something more poetic and decided what I offered was better.
The bell moved in my bones before it moved the air. The kids startled and then laughed at themselves for startling. Chairs scraped. They poured into the hallway river, which had no intention of turning off gravity for ten seconds ever, and yet manages to feel weightless when you’re in it.
Mia hung the poster by the door with two strips of tape like she was affixing a ward. Emma took a photo of it because nothing is real until it’s in the cloud. Luis whispered to the duckweed because he respects chlorophyll. Malik did a soft jump on the mat, just to feel how his legs remembered the ground.
When the room was briefly mine again, I walked to the desk and touched the meteorite’s case with one finger, the same way I always touch it, like a not-religious person tapping a saint’s shoe. Gravity had not turned off. The floor had held. The air had done what air does. But for a while, we had practiced the ten seconds when it might have betrayed us, and in practicing, we’d made a map.
I put my palm on the mat and felt its give. I felt the building hum a little with air through ducts and teenagers through the halls. I felt my blood fall in my veins and realized how much of being human is trusting the constant you never see.
The door opened again. The second period arrived. I popped a new marker and wrote the question fresh, because somewhere in these new faces would be another plan and another mayhem, and I would forgive both and choose the plan.
“Okay,” I said to them and to the floor and to the rock. “Ten seconds. Go.”