Book review of James Costa's biography of Darwin's latter life at Downhouse.  Costa does a terrific job describing Darwin's approach to empirical science. 

My perspective, co-authored with Joseph Travis, came out in Science today. We comment on Patrik Nosil et al. (2018) who assess the (un)predictability of evolution in Timema stick insects. Their work raises questions as to why evolution is predictable in some systems (e.g., microbes and viruses), but not others. 

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