WALHT make a wind vane

we are learning how to make a wind vane here's how you make it 1.Make a hole in the top of a plastic cup with a drawing pin. Push a pencil through it. Secure the cup to a plate.

how a solar cars work

it is a very simple way of making or learning about a solar car. If it is in the sun it will be energized and then move. If it is in the shadows it wont work