Is a knife a wedge? Why?
Why is the force of gravity stronger for an elephant than for a bird?
How is electricity distributed to our houses?
Does electricity flow when the circuit is open?
Why can the things around us become electrically charged?
Why do we differentiate the sound of a piano or an electric guitar?
What simple machines can we find in a bicycle?
Why do people like to sing inside the shower?
What do we call the dark silhouette produced by opaque objects?
Why do we see a black cat? What colours does it reflect?
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