Arrival of the Fittest: Solving Evolution's Greatest Puzzle" by Andreas Wagner explores the fascinating question of how complex traits arise in nature. Key points about the book: Focus on Innovation: It delves into the "missing piece" in Darwin's theory of natural selection, which explains how advantageous traits are preserved but not how they originate. Role of Random Mutations: Wagner highlights the role of numerous random mutations within species that combine to form complex traits. Laws Governing Adaptation: The book argues that adaptations are not just driven by chance, but by a set of laws that govern the emergence of new traits. Balance Between Robustness and Evolvability: Wagner introduces the concept of "innovability," which relies on a balance between robustness (the ability to withstand change) and evolvability (the capacity to change). Examples from Nature: