Roll the Can, No HandsYou need: a balloon, blown up and tied, an empty drink can lying on its side on a smooth table, and a line of tape two hand spans away. Goal: rub the balloon on your hair, hold it near the can and lead the can over the line without touching it. Why it works: the charged balloon shifts the charges inside the metal, and the near side of the can is pulled toward it.
Clip on a LeashYou need: a steel paper clip tied to a thread, the other end of the thread taped to the table, and a magnet. Goal: lift the clip with the magnet, then ease the magnet away until the clip hangs in the air on its taut thread, touching nothing. Hold it there for a count of five. Why it works: a magnet’s field is invisible, and it pulls on steel across a gap.
Clip Through the MazeYou need: a paper plate resting on two cups, with a winding path drawn on it in marker, a steel paper clip on the start, and a magnet held under the plate. Goal: steer the clip along the path to the finish without it crossing a line. Why it works: a magnet pulls on steel without touching it, the way a fridge magnet holds a note to the door.
Pepper Off the SaltYou need: a plastic spoon, a wool sleeve, and a saucer with a pinch of salt and a pinch of ground pepper stirred together. Goal: rub the spoon and lower it slowly over the saucer until pepper jumps up to it. Start high: too low, and the salt comes too. The judge wants a speckled spoon and almost no salt. Why it works: a charged object pulls light, loose bits toward it.
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Static and magnets, continued
Roll the Can, No HandsYou need: a balloon, blown up and tied, an empty drink can lying on its side on a smooth table, and a line of tape two hand spans away. Goal: rub the balloon on your hair, hold it near the can and lead the can over the line without touching it. Why it works: the charged balloon shifts the charges inside the metal, and the near side of the can is pulled toward it.
Straw CompassYou need: a plastic drinking straw balanced across the cap of an upright bottle, and a balloon. Goal: rub the balloon on your hair and bring it near one end of the straw. Lead the straw around two full turns without touching it or blowing on it. Why it works: a static charge attracts light things nearby, and the balanced straw is free to follow.
Three Clips Hanging in a RowYou need: a bar magnet or a strong fridge magnet and 5 steel paper clips. Goal: hang one clip from the magnet, then a second from the tip of the first, and a third from the second, each held only by the one above. Three in a chain for a count of three win. Why it works: steel is one of the materials a magnet can magnetize, so each clip acts as a weak magnet for the next.
Tissue Bits to the BowlYou need: a plastic comb or ruler, a wool sleeve, a plate of 20 torn bits of tissue paper and an empty bowl. Goal: rub the comb on the wool, pick the bits up with it and shake them off over the bowl. Fifteen in the bowl win. No fingers on the paper. Why it works: a static charge attracts light scraps such as paper.
Two Balloons Keep Their DistanceYou need: 2 balloons, blown up and tied, each hanging on a thread as long as your arm from the same spot on a door frame. Goal: rub both balloons on your hair or a wool sweater and let them hang. A gap as wide as your hand between them for a count of three wins. Why it works: both balloons carry the same kind of charge, and like charges repel.
Water and surface tension 8
Drops on a PennyYou need: a penny on a saucer, a cup of water and a drinking straw or a dropper. Goal: add water one drop at a time until the penny wears a dome. Fifteen drops before any runs off win. To use the straw, dip it and cap the top with a fingertip. Why it works: water molecules pull on each other strongly, and that surface tension holds the dome together.
Float a Steel ClipYou need: a bowl of still water, 4 dry steel paper clips and a fork. Goal: lower each clip flat onto the water with the fork so that it floats. Three afloat at the same moment win. A clip that sinks is dried before it is tried again. Why it works: surface tension lets small things that are denser than water rest on its surface.
Pennies Over the BrimYou need: a glass filled with water to the very brim, standing on a tray, and a pile of pennies. Goal: slide pennies in edge first, one at a time, without a drop running down the outside. Ten in win. Look from the side: the water stands higher than the rim. Why it works: surface tension makes a liquid’s surface shrink to the smallest area it can, which holds the bulge together.
Pepper Runs for the RimYou need: a plate of water, ground pepper, a toothpick and a drop of dish soap on a saucer. Goal: dust the water with pepper, dip the toothpick in the soap and touch the middle of the plate once. One touch has to clear a patch wider than a cup. Why it works: soap is a surfactant, and surfactants lower the surface tension of water.
Pour Down the StringYou need: 2 cups on a tray, one half full of water, and a piece of cotton string as long as your forearm, soaked first. Goal: hold one end of the string inside the empty cup and the other end across the lip of the full one, pull it taut on a slope and pour slowly along it. Fill the second cup to a finger’s width. Why it works: water molecules stick to one another (cohesion) and to the wet string (adhesion), so the stream follows the string.
Sink or Float, Called FirstYou need: a bowl of water and a tray of 10 small things, such as a cork, a key, a crayon, an eraser, a bottle cap, a pencil and a rubber band. Goal: sort them into a sink pile and a float pile by guessing, against the clock. Then the judge tests each one. Eight right win. Why it works: a thing denser than water tends to sink, and a less dense one can float.
Ten Drops Into OneYou need: a sheet of wax paper, a cup of water, a straw to drip with and a toothpick. Goal: dot 10 separate drops onto the wax paper, then drag them together with the toothpick, one by one, into a single big drop. No stray droplet may be left behind. Why it works: water is strongly cohesive, which means its molecules stick to one another.
Water Climbs the TowelYou need: a strip of paper towel with a pencil line across its middle, a clothespin and a glass with a finger of water in it. Goal: pin the strip to the rim so that only its bottom edge touches the water. The water has to climb to the line before zero, so choose how low to hang it. Why it works: paper towels take up liquid by capillary action, which moves a liquid through narrow spaces with no outside push.
Balance and motion 8
Clothespin BalancerYou need: a craft stick and 2 spring clothespins. Goal: clip both pins to one end of the stick so that they point down and out, like a pair of legs. Stand that end of the stick on your fingertip, upright, and take your other hand away. Upright for a count of five wins. Why it works: the pins hang lower than your fingertip, which puts the center of mass below the support.
Fingers Find the MiddleYou need: a yardstick or a broom handle. Goal: rest the stick across your two forefingers, held far apart, and slide the fingers slowly together until they meet. Take one finger away and keep the stick level on the other for a count of ten. Why it works: a stick stays level when it is held up at its center of mass, also called its balance point, and that is where the sliding fingers end up.
Hang It Twice, Balance It OnceYou need: a partner, an odd cardboard shape with 2 holes punched near its edge, a pencil, a marker and a thread with a paper clip on its end. Goal: one player hangs the card and the thread from the pencil by one hole; the other draws a line along the thread. Repeat from the second hole. Balance the card flat on the pencil’s blunt end, where the lines cross, for a count of five. Why it works: hang a shape from two points, drop a plumb line each time, and the lines cross at its center of mass.
Knock Out the Bottom BlockYou need: a tower of 6 checkers or flat wooden blocks on a smooth table, and a ruler. Goal: swipe the ruler flat along the table so that it knocks out only the bottom piece and the rest of the tower drops straight down and stays standing. Three pieces removed win. Everyone stands behind the swing. Why it works: inertia. The pieces above are at rest and tend to stay at rest.
Marble in an Upside-Down JarYou need: a marble on a table, a clear plastic jar whose mouth is a little narrower than its body, and a bowl an arm’s length away. Goal: put the jar over the marble, swirl it until the marble races around the inside, lift the jar while still swirling and carry the marble to the bowl. Stop swirling and it drops in. Why it works: a thing moving in a circle is kept there by a force toward the center, here the push of the jar wall.
Pail Over the TopYou need: a small plastic pail with a handle and a cup of water in it, outdoors on grass, with nobody within three steps. Goal: swing the pail in full circles over your head, arm straight. Five circles without a drop falling out win. Start with a strong swing and stop low, in front of you. Why it works: the bottom of the pail keeps pushing the circling water toward the center of the circle.
Send Two, Get TwoYou need: 6 marbles and a track made of 2 rulers taped side by side with a narrow gap between them. Goal: line up 4 marbles, touching, in the middle of the track. Roll one marble into the row and one leaves the far end. Now roll two together so that exactly two leave. Do that three times. Why it works: the row passes along the momentum of whatever hits it, the idea behind the desk toy called Newton’s cradle.
Snatch the PaperYou need: a strip of paper as long as your hand, lying half over the edge of a table, and a capped marker pen standing upright on the strip. Goal: pull the paper out from under the marker so that the marker stays standing. Three clean pulls win. A fast, level snatch works, and a slow pull does not. Why it works: inertia, the tendency of a thing at rest to stay at rest until a force moves it.
Build it and test it 8
Dry Tissue DiveYou need: a clear plastic cup, a tissue and a bowl of water deeper than the cup. Goal: wedge the tissue into the bottom of the cup, turn the cup mouth down and push it straight to the bottom of the bowl. Lift it straight out. Three dives with a dry tissue handed to the judge win. Why it works: air is trapped in the upturned cup and keeps the water out, as in a diving bell.
Fold a Bridge for Twenty PenniesYou need: one sheet of printer paper, 2 books lying a hand span apart and 20 pennies. Goal: fold the sheet so that it spans the gap and carries all twenty pennies without touching the table. No tape. Pleats like a paper fan, running from book to book, are the usual answer. Why it works: folds that run along the span make a thin sheet much harder to bend, as the waves do in corrugated roofing.
Low, Middle, HighYou need: an open box or a baking pan and 3 rubber bands. Goal: stretch the bands across the box so that plucking them in order plays a low note, a middle note and a high note. The judge listens with eyes shut and has to hear three clear steps. Why it works: a tighter or shorter string vibrates faster and sounds higher, which Mersenne’s laws describe.
Stop the Marble in the SquareYou need: a ramp made of 2 rulers taped side by side and propped on a book, a marble, and a square of tape on a tablecloth two hand spans past the ramp. Goal: let the marble go, without a push, from the right height on the ramp so that it stops inside the square. Two stops win. Why it works: the higher the marble starts, the more energy its height gives it and the farther it rolls.
String Phone, Five WordsYou need: 2 paper cups joined by a string through their bases, long enough to cross the room, a pencil and paper, and a partner. Goal: pull the string taut. One player whispers 5 words into a cup, one at a time, and the other listens through the second cup and writes them down. Four right win. Why it works: the cup turns the voice into vibrations that travel along the taut string.
Tube Run to the CupYou need: 3 cardboard tubes, masking tape, a marble, a cup and a door or a wall you may tape to. Goal: tape the tubes up in a zigzag so that a marble dropped in at the top rolls through all three and lands in the cup. Building time counts. One clean run wins. Why it works: the marble’s energy comes from its height, so every tube has to slope down.
Twin PendulumsYou need: 2 metal washers or keys, each on a thread taped to the edge of a table so that it swings freely, one thread clearly longer than the other. Goal: shorten the longer thread, by taping it again, until the two swing in step, side by side, for five swings. Let them go together from the same height. Why it works: a pendulum’s swing time depends on its length, and not on the weight at the end.
Two Brooms and a RopeYou need: 2 broomsticks, a rope about four times as long as a broom, and three players. Goal: two players hold the sticks an arm’s length apart. Tie the rope to one stick, wind it back and forth around both four times, and give the free end to the third player, who pulls steadily while the holders resist. Sticks touching before zero win. Fingers stay clear of the rope. Why it works: each pass of the rope adds to the pull, as in a block and tackle.
How this list was compiled: An original list of October 2026: 32 one-minute challenges that each show one idea from school science, written for this page and copied from no television show and no other list. Classroom demonstrations are common property, so a game here may be shown elsewhere under another name. The line that says why each game works was checked on 2026-10-13 against the English Wikipedia article on its idea (en.wikipedia.org, text under CC BY-SA 4.0) and says no more than the article does. The articles: Static electricity, Electrostatic induction, Electric charge, Magnet, Surface tension, Soap, Capillary action, Buoyancy, Cohesion (chemistry), Center of mass, Inertia, Centripetal force, Newton’s cradle, Corrugated galvanised iron, Diving bell, Tin-can telephone, Mersenne’s laws, Potential energy, Pendulum, Block and tackle. The answer about damp air rests on the Static electricity article. The tip about balloons, coins and marbles states what the American Academy of Pediatrics’ choking prevention page lists (https://www.healthychildren.org/English/health-issues/injuries-emergencies/Pages/Choking-Prevention.aspx, read 2026-10-13). No game uses a flame, a chemical or a small strong magnet, and nothing is eaten or drunk. No game has been stopwatch-tested: every target (fifteen drops, twenty pennies, three clips) is a starting point for the host to raise or lower. Licence: own work
How it works
Each of these 32 science one-minute games ends with a line on why it works. Minute to Win It, a TV game show, built its challenges around 60 seconds and things from around the house; this list is ours, not the show’s.
Read the full guide
Science one-minute challenges by topic
Static and magnets holds 8, Water and surface tension 8 and Balance and motion 8. Each reason was checked against the Wikipedia article on that idea, so the judge can explain the result.
One-minute games for engineers
Build it and test it holds 8 design problems: a paper bridge for twenty pennies, a marble run from three tubes, twin pendulums, a rope that lets one player out-pull two. Nobody has run a stopwatch over these targets, so change any number after a first try.
Balloons, coins and marbles are on the American Academy of Pediatrics list of household choking hazards for young children. Count them back in.
Do the water games over a tray, and dry the paper clips between tries.
Questions and answers
Which ten science one-minute games should I start with?
Ten to start with holds 10 that need only everyday things: a balloon, a penny, pepper, a tissue, a sheet of paper. Roll the Can, No Hands and Drops on a Penny are the quickest to set up.
Do these work as STEM one-minute challenges for a class?
Yes. Every prop is a household or classroom thing, and 12 games are marked Easy. Set one game at each table and move the groups on every minute.
Why do the static games fail on some days?
Moisture in the air lets a static charge leak away, so a humid room spoils them. Play them in a dry room, with dry hair or a wool sweater to rub the balloon on.