Think up some silly products, such as a chocolate teapot. It would melt as soon as you added hot water. Draw pictures of your ideas. The clip below might give you some inspiration if you are struggling. We can't wait to see what you come up with :)
Take a clean plastic sandwich bag. Carefully pour some water into it, so it is a third full. Seal it and tape it to a window that gets the sun. Watch what happens inside the bag when the sun is shining on the window. Can you explain this?