How does sound travel?
Why is the mirror in the water? What made the colours?
How does the energy come out of the battery?
How does the nail become a magnet?
Why does the coloured water move from cup to cup?
Why does the magnet keep turning so the red is on that side?
Could lemons really made a battery?
How can a pin stay up in the air by itself?
Is it magnetic or non-magnetic?