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>Racism, poverty, IQ tests, hoola hoops, etc. are social constructions. Gravity >is _NOT_ a social construction. Gravity exist with or without people. (Does I would dispute this. When physicists discuss gravity they are working within a collection of socially-defined terms and concepts. Whether gravity exists without people to interpret it as gravity (or some other human & social construction like, say causality) is like the question of the tree falling in the middle of the woods. Gravity is a socially-negotiated construct made from individual perceptions of a phenomenon. I think gravity is one of the neater scientific stories because of the radical changes in the historical paradigms associated with it. In Aristotles' day observation and measurement were unimportant when speaking of gravity, tele- ological (ultimate) causes were the real issue. After Newton, gravity was only important in terms of mechanics -- measurement and calculation; and it was super uncool to actually discuss why or what caused it. Nowadays, it is semi-cool to talk about particles mediating gravitional interactions (gravitons) even though nobody has ever confirmed their existance. But if you are a scientist examining why gravitational force scales as 1/r^2 and not 1/r^1.9999999998 you are a flake (like one of my profs). Such people are fifth force theorists and most physicists wouldn't want their daughter married to one. Not only is gravity socially constructed, but we vary the construction regularly. Wait till they find gravitons, and we'll see some more remod- elling of the construction. Dan "Indeed, from childhood we have become familiar with the appearance of physical equations in non-Cartesian systems, such as polar coordinates, and in non- inertial systems, such as rotating coordinates..." - Steven Weinberg, Gravitation & Cosmology, p 92 Dan MacIsaac, Grad student in Physics & Science Ed, firstname.lastname@example.org