Mount Everest

The highest mountains will drive those ascent them briefly mad.

Now, researchers say, these psychotic episodes represent a personality's own medical condition and should be distinct from asphyxia.

"Mountains area unit maddeningly stunning, however we have a tendency to didn't expect that they will drive US to madness," aforementioned study author Dr. hero Brugger, head of the Institute of Mountain medical specialty at Eurac analysis in metropolis, Italy, told Live Science. The researchers elaborated their findingsonline Dec. five within the journal psychiatry.