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 theAlfred 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 our brain waves, our genomes, and our cardiovascular and immune systems; its opposite, loneliness, can kill. At long last, social connection is recognized as critical to wellness and longevity.