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As I was saying, it can be a difficult task of making up your mind on one perfect science fair project which can bag you the gold in your race with several other strong competitors. It is most likely that you may consider a highly advanced project with all kinds of fancy scientific terms, explanation, theories, instruments, presentation, etc. But what I feel as a student of science myself, pick up a project that reconciles with your level of understanding and you must know its intricacies well. For instance, it is not a big deal to present a project on cosmic rays. But what becomes challenging is grasping the scientific explanation behind this phenomenon, which, definitely isn't the cup of tea for a student in middle school.

Ideas You Can Work on for Science Fair Project
  • What is the origination of so many languages of mankind?
  • What is the reason for moths and other kinds of insects to get attracted towards light sources?
  • What are the types of molds and which is the most harmful to humans and pets?
  • Why is the sky blue?
  • What are the different types of rocks and how are they formed?
  • What is the working principle of an electromagnet?
  • Does music affect the memory of the human brain?
  • Is it true that a male clownfish can become a female?
  • How are tides formed?
  • Is it true that plants grow well when they are exposed to soothing music?
  • How does a hydroelectric power plant work?
  • How does a tube-light glow?
  • Working of volcanoes.
  • What is the reason behind motion sickness?
  • Why oil and water don't mix?
  • Which is the only planet whose day is longer than its year?
  • What's the role of bees in maintaining the ecosystem?
  • Is there any rock that is light enough to float on water? And if yes, then what it is and how does it do that?
  • What makes an egg float on salty water but sink in freshwater?
  • How do cockroaches survive all kinds of weather and even nuclear radiation?
  • What helps animals sense natural disasters?
  • Preserving and protecting food without a refrigerator.
  • The pH level of rainwater has variations from place to place. How is that so?
  • How to use air pressure to make an egg go inside a bottle by itself?
  • Is it possible for different colors to absorb heat in different fashion?
  • Is it possible to create light by chewing gum?
  • Which color is the most visible to the human eye in a foggy weather?
  • How long can a snail survive without its shell?
  • Explain the greenhouse effect and how is it related to global warming?
  • A project explaining the fundamentals on genetics.
  • What makes ice clear and snow white?
  • Why can't even light escape the black hole?
  • Why is Uranus a faint blue?
  • Uranus is closer to the Sun than Neptune is, but still is the coldest planet in the Solar System. How?
  • Fill a plastic bag with water and drop an egg in it. Close the bag and hold it over a flame. The plastic won't melt but the water will get heated and the egg would start boiling. How is it possible?
  • Different colors are known to affect blood pressure of a person. How?
And that would be it for the ideas I had for you for your science fair project. So get started with finding the answers to all these questions and once you get them, you can start off with setting up your project. Best of luck!