Harvard Book Store, the Harvard University Division of Science, the Harvard Library, and Long Now Boston welcome Andrew H. Knoll—Fisher Research Professor of Natural History and Earth and Planetary Sciences, Emeritus, at Harvard University, and author of A Brief History of Earth and Life on a Young Planet—for a discussion of his new book Earth and Life: A Four Billion Year Conversation. He will be joined in conversation by Robin Wordsworth—Gordon McKay Professor of Environmental Science and Engineering, Professor of Earth and Planetary Sciences, and Co-Director of Graduate Studies at Harvard University