When we picture evolution, we think of fish crawling from the sea hundreds of millions of years ago, or birds evolving into new species on remote islands. But evolution takes place today, in the most unexpected places--in city parks, in farm fields, and in hospitals. Humans, scientists now recognize, are a powerful evolutionary force, pushing life in new directions. Now, researchers are wondering where we're headed. Carl Zimmer, author of Evolution: Making Sense of Life, will present some of the ways that modern civilization drives evolution and current thinking about humans as a force of change.