Food labels have become battlegrounds. Just last week, voters in Washington state narrowly defeated a measure that would have required food manufacturers to reveal whether their products contain genetically modified ingredients.
Supporters of the initiative — and similar proposals in other states — say that consumers have a right to know what they're eating.
But there are lots of things we might want to know about our food. So what belongs on the label?
Scientists have used some new tricks and old dogs to show that thousands of years ago, wolves may have first become man's best friend in Europe.
Researchers extracted DNA from ancient wolf or dog fossils and compared it with DNA from modern dog breeds and wolves. Until recently, labs didn't have the kind of genetic tools they'd need to work with such old dog DNA and do this kind of detailed comparison.