It is impossible to do science without measuring  It is impossible to measure without having first selected units of measurement  Hence, science is arbitrary, since the selection of a unit of measurement -- kilometer, mile, fathom, etc
-- is always arbitrary
It is permissible to sit on the park benches. To sit on the park benches one must walk to them. One way to walk to them is by walking on the grass. So it is permissible to walk on the grass.