To a first approximation, all biologists believe in evolution.
Hm. I'm not sure how many biologists there are, but my guess is this allows for uncertainty on the order of a million biologists. Is the situation really that bad? I would have guessed that at least to a third approximation all biologists believe in evolution.
Are you reading "to a first approximation" as "to one significant figure"? I thought it meant something like "using the lowest order function which is an accurate fit to the data". So, to a first approximation, pi is roughly 22/7, and to a first approximation, the distance to Earth's horizon in kilometers is 3.57 times the square root of the height above sea level in meters.
To say that "to a first approximation, all biologists believe in evolution" is, by this definition, to say that the fraction of biologists that d...
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