What I don't understand is that this "theory" seems really easy to disprove. Why do things travel down instead of up or right or left?
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The Titanic sank.
Malaysian Flight 370 crashed.
A steel boat holds air, that's why it doesn't sink, the air that it holds is less dense than water, so it reaches an equilibrium with the weight of the boat and achieves buoyancy.
No, that is wrong. It has nothing to do with air because the ship is not air-tight. It does not sink because the hull tries to displace its weight in water. So take two hulls; both weigh 1 ton and contain the same amount of air. One is shaped with a flat bottom, very wide with low sides, the other is a very narrow wedge with super tall sides, which one would sink? The wedge would sink because it does not have enough sideways displacement force to counteract gravity.
So Bull Boat vs Canoe or what?