A bright young star on the medical school faculty, Jason Pearce worries that he’ll lose NIH funding as his basic research falters.  He signs a contract with a venture capital company that enables him to embark on a study of mice whose memory fails as they age.  He discovers that their forgetfulness is due to a defective memory gene; that the loss can be prevented by injecting young mice with the normal memory gene; and that the same type of gene defect increases the risk of Alzheimer’s Disease. With approval of his medical school’s ethics review board, he...