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The Cavendish Experiment alone ends flatearthfags. It proves that mass attracts mass in a controlled environment and gravity is (obviously) a bit more sophisticated than "things fall down because d'uh, obviously".
Remember, flat earth fags: if you are shit at high school physics, that's OK. It's fine that you never really understood the idea of the scientific method and the incredible way that math models the real world. Not everyone needs to be an engineer. There are plenty of great careers you can have while being a physicslet. But you must be open to the possibility that the failure is not in the reasoning of the scientists and the experiments and astronomy we've been able to do to verify it for hundreds of years; the failure is in your ability to understand things like Newton's Laws, circular motion, momentum and reference frames and your ignorance of things like the aforementioned experiments, Galileo's observations of Jupiter's moons and what GPS is.
It's a fair thing in this world to question authority. But in this case, you're being retarded.