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#1
Q: Why is the sky blue?
A: Rayleigh scattering — blue light (short wavelength) scatters most through air.
#2
Q: Why does ice float?
A: Ice is less dense than liquid water — water expands when freezing.
#3
Q: What causes thunder?
A: Air rapidly heated by lightning expands, creating a shockwave.
#4
Q: Why do we see rainbows?
A: Sunlight refracts and reflects inside water droplets, splitting into colours.
#5
Q: Why does salt melt ice?
A: Salt lowers the freezing point of water.
#6
Q: What causes tides?
A: Gravitational pull of the Moon (and Sun) on Earth's oceans.
#7
Q: Why do we get goosebumps?
A: Arrector pili muscles contract — an evolutionary leftover from when we had more body hair.
#8
Q: What causes a sonic boom?
A: An object travelling faster than sound creates a shock wave.
#9
Q: Why is copper used in wiring?
A: Excellent conductor, ductile, flexible and affordable.
#10
Q: Why does a mirror appear to flip left-right?
A: It flips front-back; our brains interpret this as left-right.
#11
Q: What makes things magnetic?
A: Unpaired electron spins creating magnetic fields; aligned domains make magnets.
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