> why is it such a nice round integer? Significant Figures [1] [1] http://www.bbc.co.uk/schools/gcsebitesize/maths/number/roundestimaterev3.shtml http://www.b

> why is it such a nice round integer? Significant Figures [1] [1] http://www.bbc.co.uk/schools/gcsebitesize/maths/number/roundestimaterev3.shtml http://www.bbc.co.uk/schools/gcsebitesize/maths/number/round...