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Not gravity unless they're studying mice in space with some expectation that the subjects are unaffected by the vast different in gravitational pull.

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"Apparent gravity on the earth's surface varies by around 0.7%, from 9.7639 m/s2 on the Nevado Huascarán mountain in Peru to 9.8337 m/s2 at the surface of the Arctic Ocean"

http://en.wikipedia.org/wiki/Gravity_of_Earth#Variation_in_g...

That's what I was going for, gravity has probably almost never been controlled for.

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