“
1. A little seed weighs next to nothing but a tree weighs a lot. From where does the tree get the stuff that makes up a wooden desk?
2. Can you light a little torch-bulb with a battery, a bulb and one piece of wire?
3. Why is it hotter in summer than in winter?
4. Could you scribble a plan diagram of the solar system showing the shape of the planets’ orbits?
