Harry is building a model bridge. Should he use wood, metal or plastic? Which will be strongest? How he can he find out?

How can you answer questions in science? Some questions are too hard for you to answer but some are more simple. Where will you look for answers? How will you investigate your ideas? How can you test different materials? What can you use? There is often more than one way of answering a question in science. Using books and the internet to investigate is a good thing.