Church attendance has been steadily falling in the U.S. and other developed countries for decades, causing a rise in people who tell pollsters that they are unaffiliated with any organized faith.

Delusions—fixed false beliefs—can be tricky to study. And it's not yet clear how the brain gives rise to these departures from reality. Further, there are many types of delusions. Those with ...

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Terms such as delusions or conspiracy theories express a disapproving attitude. Suppose I am convinced that a celebrity I have never met is in love with me. My belief may be considered delusional. To ...