Scientists are considering the idea that our perception of reality is shaped not only by our senses but by our brains creating an internal map or model of the world around us.

This means our perception of what’s true or real is malleable, and we are at risk of losing our grasp on it. The result can be tragedies like the Jonestown mass suicide and Nazi Germany.

Some philosophers think that evolution cares more about how to survive than about any accurate version of reality, which can lead to “useful fictions” about the world.