Decision Delayed on Dangerous Chemical Found in Drinking Water…

The U.S. Food and Drug Administration is in the process of deciding whether to allow genetically modified salmon to be sold to American consumers and how to label them if they are sold. Margaret Warner gets two perspectives.

An effort to develop a treatment for Alzheimer's disease was halted after data showed that a new drug was doing more harm than good, leading to more memory loss and putting people at a higher risk for skin cancer. Judy…