The oddities of social life—and our efforts to cooperate and coordinate—may turn on our assumptions about the knowledge we share.

President Trump warned that acetaminophen, the active ingredient in Tylenol, is a potential cause of autism. WSJ’s Brianna Abbott explains if science backs up the claim. Photo: Kevin ...

In a new book, the Harvard psychologist Steven Pinker argues that an awareness that everyone knows what you know is a powerful driver of human social life. By Dennis Duncan Dennis Duncan teaches ...

The Transportation Security Administration has added yet another item to its laundry list of things passengers must be cautious about when packing their luggage. While electric toothbrushes are ...