[AnimalMuppet]

> Energy is conserved in any iteraction.

True. But gravity is a conservative field (again, neglecting radiation), meaning that the energy that goes into raising something against gravity, you can get back by lowering it to the original position again.

> And gravity is not a force. Gravity is the curvature of space-time.

If we're not in "overly pedantic argumentation" mode, then I'd say, go climb some stairs. Feel that? That's a force. But if we are in "overly pedantic argumentation" mode, then yes, gravity is the curvature of space-time in General Relativity. That may not be the final word, though. What is gravity in Loop Quantum Gravity?

[throwaway7808]

Let me give you a clue. Are you in the gravitational field of the Sun? How does it compare with the gravitational field of the Earth? Is it stronger or weaker? Do you feel it? What's the trajectory of the earth in the curved space-time around the sun?

When you'd say "go climb some stairs" what you feel are the stairs. And you should also feel like a bit of an idiot, in my humble opinion.