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Free Topic Selection Wizard, science fair project ideas, step by step how to do a science fair project, Ask an Expert discussion board, and science fair tips for success. Read more

Over 1,200 free science projects searchable by subject, difficulty, time, cost and materials. Browse the library or let us recommend a winning science project for you! Read more

What is the Scientific Method? The scientific method is a process for experimentation that is used to explore observations and answer questions. Does this mean all scientists follow exactly this process? No. Some areas of science can be more easily tested than others. For example, scientists studying how stars change as they age or how dinosaurs digested their food cannot fast-forward a star's life by a million years or run medical exams on feeding dinosaurs to test their hypotheses.… Read more

Overview A bibliography is a listing of the books, magazines, and Internet sources that you use in designing, carrying out, and understanding your science fair project. But, you develop a bibliography only after first preparing a background research plan — a road map of the research questions you need to answer. Before you compose your bibliography, you will need to develop your background research plan. With your background research plan in hand, you will find sources of information… Read more

What does it mean for a solution to be acidic or basic (alkaline)? It all has to do with hydrogen ions (abbreviated with the chemical symbol H+). In water (H2O), a small number of the molecules dissociate (split up). Some of the water molecules lose a hydrogen and become hydroxide ions (OH−). The "lost" hydrogen ions join up with water molecules to form hydronium ions (H3O+). For simplicity, hydronium ions are referred to as hydrogen ions H+. In pure water, there are an equal number of… Read more

Over 100 career profiles to help students explore careers in science, technology, engineering, and math. Read more

What is the Engineering Design Process? The engineering design process is a series of steps that engineers follow to come up with a solution to a problem. Many times the solution involves designing a product (like a machine or computer code) that meets certain criteria and/or accomplishes a certain task. This process is different from the Steps of the Scientific Method, which you may be more familiar with. If your project involves making observations and doing experiments, you… Read more

February is Black History Month. Learn more about some of the many African American scientists and engineers who have made important contributions to science history. Black History Month: 28 Scientists to learn more about! Update! This post has been updated for 2021 to include additional African American scientists and engineers. In honor of Black History Month, we highlight 28 African American scientists and engineers who made important contributions to… Read more

It would be useful to have a measure of scatter that has the following properties: The measure should be proportional to the scatter of the data (small when the data are clustered together, and large when the data are widely scattered). The measure should be independent of the number of values in the data set (otherwise, simply by taking more measurements the value would increase even if the scatter of the measurements was not increasing). The… Read more

What are Variables? Scientists try to figure out how the natural world works. In doing so, they use experiments to search for cause and effect relationships. Cause and effect relationships explain why things happen and allow you to reliably predict what will happen if you do something. In other words, scientists design an experiment so that they can observe or measure if changes to one thing cause something else to vary in a repeatable way. The things that are changing in an… Read more