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:D It depends on what you mean by that. If someone asked me in a club, "What is two times two?", I would tell them to go away or punch them in the face, and I think that would be the most appropriate reaction. :)

So, questions in a club can distract a girl, which leads to an error in her answer, which will defuse the situation, and you both laugh/smile => you achieved what you wanted, and collecting statistical data about the quality of knowledge becomes irrelevant.)))

Ihtiandr, he meant that you can take the sun as a reference point and rotate around it, or you can observe the sun from Ai-Petri and watch how it moves across the sky. What does centripetal acceleration have to do with it? Or do you think that acceleration doesn't exist when the reference point changes?