Galileo project?

Question

I'm doing a project on the principles that Galileo has discovered in the field of physics. I was wondering if I had missed any that anyone knew of. So far I have:
1) his work on pendulums
2) theory of motion and unifrom acceleration
3) work on inertia
4) parabolic fall
Anything else? Also, any ideas for a good model? It can't be a poster or something restating our paper, she's looking for an application or reenactment of one of his experiments.

Answer 1

Gravity(not the Mood -tides relationship, but that all objects fall in based on mass not size) and Relativity!
I kid you not!