Sometimes the world can feel out of control so it's nice to think that the one thing we do have control of is what goes on inside our own heads. But, what if this wasn't as true as we'd like to believe?

Before LSD, magic mushrooms and MDMA were street drugs they were seen as one of the most exciting things in psychiatry.

Our understanding of the world is always evolving, but what happens when something we we were almost certain is real starts to be questioned?