Science journalist Lydia Denworth joins Cool Science Radio. Denworth has investigated and written on everything from Alzheimer’s to zebrafish. She now writes on the science of friendship in a new book that explores the evolution, biology and extraordinary power of life’s fundamental bond. Her work is supported by the Alfred P. Sloan Foundation . In her new book called Friendship , she meets scientists at the frontiers of brain and genetics research and discovers that friendship is reflected in