Simple experiments are best. If the experiment is too complex, unknown variables can interfere with the results. Even if your experiment does not work, or something unexpected happens, you will have learned something. Sometimes unsuccessful scientific research is used as a model for other experiments. Knowing that something did not work is actually knowing a lot.
Scientists often study very complex problems.
They can spend a lifetime and not find the answers. Even so, their research is valuable to other scientists. The failed experiment can be used by someone to find out the correct answer. The scientists at the Agricultural Research Service encourage you to try to solve an agricultural research question using the resources available at your local school or public libraries.