I really need help with my IA! I had a topic focusing on how different liquids form stains and calculating the angle of impact based on that, but my teacher said she's afraid it's too simple since I'm using very basic trigonometry. So I tried to come up with another idea but I'm totally lost! I thought of doing something related to traffic accidents, for example calculating velocity, friction etc. but I think it's not original enough...and I'm really terrible at math.