Bill Agosta, Professor Emeritus from Rockefeller University, presents the influential role of chemical communication in biology. This early evolutionary system, found in organisms from bacteria to elephants, enables complex coordination without words or wires. Pheromones allow communication within species—for example, for locating food or mates—while interspecies chemical signals, like between wasps and plants, serve functions such as warning of danger. Bill examines current research on human sexual pheromones and their emerging and inevitable commercial applications. There will be time for Q&A and discussion about this extraordinary and little understood subject.