You can make a LEGO scale building and test gravity, or build a LEGO vehicle to test how fast a standard car would pollute the air, or even, build a LEGO crane to use it as a scale to see how much a real crane could, and anything else you want to do. I am a smart LEGO builder. You can think of something else, I bet. I hope this was helpful. MAY THE BRICK BE WITH YOU, LEGO BUILDER! BE SMART ON YOUR PROJECT! :)
Well, it depends what type of science you are doing. If it was space and astronomy, build the ISS, space shuttle, rocket or the hubble telescope. Be creative! Just think of something simple to build!