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You can peruse the related link below which has number of ideas but remember your project must be original .
Yes, lines are a part of optical illusions it helps with the way the illusion works. I know kinda about this cuz I am doing a science fair project based on optical illusions Optical illusions are when your eyes play tricks on you. sometimes you have a blind spot, other times your brain will only see one thing at a time. The brain sees them in different forms, and the optic nerve assists
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For science fair ideas, visit www.sciencebuddies.org. There are ideas for students in grades K through 12.
Bea Saptang , from the Philippines won first place for best science fair ideas
There are many sources out there for getting science fair project ideas. The best source is Science Buddies at www.sciencebuddies.org.
Where can i find a science fair project. ----
You can do anything in a science fair a popularly choice is too do a volcano!
Sciencebuddies.com has some interesting science fair ideas that are reasonably priced. You may also want to look at ehow.com.
on the internet
Science projects
There are many science ideas to be found online. Sites such as Science Buddies, Kidz World, Cool Science Projects, and even Brown University feature dozens of science fair ideas for multiple abilities and grade levels.