A gathering of four friends and the mother of one who has just had successful stem cell therapy for cancer. A discussion of the science and potential of stem cell therapies. Another has a pregnant daughter. They talk of how germ cells from husband and wife combine to make a complete genome, how the fertilized egg differentiates, and the genes of the differentiated cell of an adult. Other topics: mutation, toxins, germs, effect of diet and exercise as the body ages.