A few years ago I climbed over a gate and found myself gazing down at a valley. After I’d been walking for a few minutes, looking at the fields and the sky, there was a shift in my perception.

As your thoughts run uncontrollably, your heartbeat starts to race and your breathing becomes heavy. Uneasiness is followed by fear, and then without warning, panic begins to set in. Suddenly you feel ...

Although humans' visual perception of the world appears complete, our eyes contain a visual blind spot where the optic nerve connects to the retina. Scientists are still uncertain whether the brain ...