Ideas Related to arduino for a goob science project for science exhibition? Answered

Hey Frnds! The is going to be a science exhibition in our school and i want to make something that is the best of all. I have recently bought an Arduino UNO and i'm excited to use it in my project. I saw many things that can be made out of arduino but i'm not sur if it can be a good project or not. Can you please give some suggestions and explain them a bit. If possible plz also give its link. I will be very grateful to all of u.