Why do soap bubbles appear rainbow-colored?
Reflection of sunlight
Refraction and interference of light waves
Soap dye pigments
Scattering of light
Why does ice float on water?
It’s lighter due to trapped air
Ice has a lower density than water
Ice is hollow
Surface tension holds it up
What gives onions their “teary” effect when cut?
Sulfur compounds
Acidic juice
Water vapor
Protein enzymes
Why do we see lightning before hearing thunder?
Light travels faster than sound
Thunder takes time to form
The atmosphere blocks sound
Lightning is brighter
Why does bread rise when baked?
Heat expands air bubbles from yeast
Water evaporates and pushes dough
Starch expands
Gluten hardens
What causes the “pop” sound when you crack your knuckles?
Bones rubbing together
Ligaments snapping
Gas bubbles collapsing in the joint fluid
Tendon friction
Why does a metal spoon feel colder than a wooden spoon at room temperature?
Metal conducts heat faster
Metal is naturally colder
Wood traps air
Metal reflects light
What makes popcorn pop?
Expansion of hot air inside the kernel
Water inside the kernel is turning into steam
Pressure from starch buildup
Heating oil cracks it open
Why does salt melt ice on roads?
It generates heat
It lowers the freezing point of water
It absorbs moisture
It breaks ice crystals
Why do mirrors reverse left and right, but not up and down?
They don’t actually reverse—our brain interprets it that way
Gravity prevents vertical reversal
Light waves behave differently horizontally
Mirrors are built that way
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