Do it first, then understand it.

Light a Bulb with One Battery: Your First Circuit Experiment

Electric current is invisible, but connect one complete loop and the moment the bulb lights up, circuits suddenly make sense.

Why Light "Bends" in Water: A First Refraction Experiment

Dip a chopstick into a glass of water at an angle and it seems to "break" at the surface. That's no illusion of the glass — it's light refraction fooling your eyes.

What Sets a Pendulum's Beat: A Period and Length Experiment

Release the same pendulum from any height, hang any weight on it — the time for one full swing barely changes. That is the isochronism of the pendulum, just as Galileo discovered it.

The Invisible Electric Field: Charging by Friction and the Forces Between Charges

Rub a balloon on your hair and it can pick up paper scraps and bend a stream of water. Behind it all are electric charges — and the invisible electric field that surrounds them.

How Waves Travel: A Frequency, Wavelength and Amplitude Experiment

Flick a long rope and humps go racing away down its length — yet the rope itself never travels anywhere. A wave carries vibration and energy, not the medium.

Balance a Ruler with Coins: The Lever Balance Experiment

On a seesaw, a lighter child sitting further out can still lift a heavier one. A lever balances on more than the size of the forces — the distance from each force to the pivot counts just as much.

Make an Egg Float: A Salt Water Buoyancy Experiment

The very same egg sinks to the bottom in fresh water, yet once you stir in enough salt it slowly rises to the surface. It isn't the egg that changed — it's the density of the liquid around it.

The Upside-Down Image in a Magnifying Glass: A Convex Lens Experiment

Held close, a magnifying glass shows you an enlarged, upright image — but hold it farther away, aim it at the window, and it throws a shrunken, upside-down world onto a sheet of paper.

Physics · 7 min read

The Secret Around a Magnet: Drawing Field Lines with Iron Filings and a Compass

A magnet pulls a paper clip toward it without ever touching it. Is that gap in between really empty? Sprinkle a handful of iron filings, and the field lines reveal themselves.

Measuring a Rock's Density with a Balance and a Graduated Cylinder

Pick up a rock by the river and no ruler can tell you its volume. A cup of water can.

Physics · 10 min read

Why Two Water Drops Merge into One: Feeling Intermolecular Forces at Home

Molecules are far too small to see, but the push and pull between them is something your own two hands can feel.

Build a Circuit That Lights: Closed, Open and Short

When a bulb won't light there are only two possibilities: the path is broken, or the current has found a shortcut around the bulb.

Series or Parallel: Two Bulbs, Two Ways to Wire Them

Same two bulbs, same battery. Change how they are wired and the brightness changes — and so does what happens when you unscrew one of them.

Ohm's Law I = U/R: Verifying It with a Fixed Resistor

How does current depend on voltage, and on resistance? Change one thing at a time and the answer surfaces on its own.

A Laser Pointer and a Mirror: Verifying the Law of Reflection

Light hitting a mirror bounces back — and not in just any direction. Measure it, and the angle out matches the angle in exactly.

A Prism Splits White Light: The Dispersion Experiment

The prism does not colour the light. Those colours were in there all along — normally piled on top of one another, which is what "white" looks like.

Chemistry

Red Cabbage pH Indicator: See Acids and Bases at Home

A single leaf of red cabbage makes an indicator that reports acidity in living color. Red, purple, blue, green — the shifting hues turn the abstract idea of acids and bases into something you can watch happen.

Chemistry · 7 min read

Make Carbon Dioxide with Baking Soda and Vinegar: Three Property Tests

Mix two kitchen staples and you have a cupful of invisible gas — one that can smother a candle flame and turn limewater milky white. Every key property of carbon dioxide is hiding inside these small phenomena.

How Much Salt Can Water Hold? Saturated Solutions and Crystallization

How much salt can water dissolve? At which spoonful does it start piling up on the bottom of the glass, refusing to budge? That moment — when no more will go in — is the very definition of saturation.

Why Ice Stays at 0 °C While It Melts: Water's Three States of Matter

You keep on heating, yet the thermometer sits motionless at 0 °C. The thermometer isn't broken — you are looking at the single most important rule of how crystals melt.

Chemistry · 7 min read

Build an Atom from Modeling Clay: Protons, Neutrons, Electrons and Elements

You can't see an atom — but you can build one. Press a seventh proton into the nucleus and the "carbon" in your hands turns into "nitrogen." What decides which element an atom is suddenly becomes obvious.

Why Does a Candle Go Out? The Fire Triangle and Three Ways to Put Out a Fire

Take one lit candle: cover it with a glass and it dies, blow on it and it dies, snip away the wick and it dies. Three ways of killing a flame — and behind them, three directions of one single rule.

Chemistry · 9 min read

Mix a 6% Salt Solution: How to Calculate and Prepare a Given Mass Percent

"Prepare 50 g of a 6% sodium chloride solution." Hidden inside that sentence are two numbers: 3 and 47. The hard part isn't the arithmetic — it's knowing why those are the numbers.

Chemistry · 10 min read

Split a Glass of Water with Pencil Leads: The Negative Electrode Collects Twice the Gas

Water looks like one single thing. Run electricity through it, and it splits into two on the spot — in proportions so fixed they might as well have been weighed out.

Biology

Biology · 9 min read

Onion Skin Cells Under the Microscope: Making and Observing a Wet Mount

A paper-thin film peeled from inside an onion turns into rows of neat little "boxes" under the microscope. Each of those boxes is a plant cell.

Five Cups of Mung Beans: What Do Seeds Really Need to Germinate?

Water, air, temperature, light — which of these does a seed actually need to sprout? Set out five cups, wait three days, and the answer grows by itself. One result will probably not be what you expected.

Green Leaves Make Starch in the Light: The Classic Half-Covered Leaf Experiment

On the same leaf, the half that saw sunlight turns blue-black with iodine, while the half hidden under black paper doesn't change at all. Two colors on one leaf — proving two things at once.

Biology · 9 min read

Seal a Jar of Sprouting Seeds: Proving Respiration with a Candle, Limewater and a Thermometer

Put germinating seeds in one jar and boiled seeds in another, seal both overnight, and run three tests the next day — a candle, limewater, a thermometer. The differences between the two jars are the textbook respiration equation, line by line.

Put a Plastic Bag over a Branch: A Bag of Water Drops Reveals Transpiration

More than nine-tenths of the water a plant's roots take in never stays inside the plant — it escapes through the leaves. One clear plastic bag is enough to make this invisible water route show itself.