Very good sentences

Call this hyperscience, a claim to scientific status that conflates the PR of science with its rather more messy, complicated and less than ideal everyday realities and that takes the PR far more seriously than do its stuck-in-the-mud orthodox opponents. Beware of hyperscience. It can be a sign that something isn’t kosher.  A rule of thumb for sound inference has always been that if it looks like a duck, swims like a duck and quacks like a duck, then it probably is a duck. But there’s a corollary: if it struts around the barnyard loudly protesting that it’s a duck, that it possesses the very essence of duckness, that it’s more authentically a duck than all those other orange-billed, web-footed, swimming fowl, then you’ve got a right to be suspicious: this duck may be a quack.

That is from Shapin on Velikovsky, with the link from The Browser.