https://www.scienceblogs.com/stoat/2010/09/28/breaking-a-butterfly-on-the-wh
Breaking a butterfly on the wheel, part II | ScienceBlogs
Part I refers, in which I take PZ to task for getting too carried away over some harmless minor piece of hydrodynamics. PZ didn't show up in the comment thread...
a butterfly on the wheelpart iibreakingscienceblogs