MDMA (Molly, ecstasy) is an empathogen widely used as a club drug that may become a future treatment for PTSD. Many respond ...

A new theory suggests that “time” might be the product of a universe that, long ago, decided to settle down into one definitive story, sparking reality as we know it.

When something goes from what everyone knows to what everyone knows that everyone knows, it has been transformed into common knowledge. And that's where things get interesting.