The scientific method is the foundation to modern science. Without a formal method of determining questions and their answers, we wouldn't have science or the knowledge we have today.

Francis Bacon, Rene Descartes, and Isaac Newton all helped contribute to the development of the scientific method as a good way to learn about nature and science. They wrote papers and discussed how using experiments and changing variables can help to determine if a guess (or hypothesis) is correct. 

The first thing to do with the scientific method is to come up with a question. Next you need to observe and gather information in order to come up with a guess (called a hypothesis) or a number of guesses to the answer. Now you run experiments to see if your guess is right. After the experiments you should check your results. Finally, after running all the tests you can think of, you present your conclusion. 

By going through this process, scientists have a way to verify their guesses and to double check each other. Another scientist can take a look at your tests and add some more tests and continue to refine your answer to the question.