Concern for all things lowly was almost an article of faith for the Wedgwood cousins, who taught young Darwin to euthanize earthworms in brine before impaling them on a fishhook.

• 从前，大部分人们认为达尔文是一个顽固的科学家，为了发现他令人震惊而无法回避的进化理论，他毫不妥协地遵循着经验研究方法的足迹。