Drug tolerance occurs when a subject's reaction to a psychopharmaceutical drug (such as a painkiller, intoxicant, or antibacterial) decreases so that larger doses are required to achieve the same effect. Drug tolerance can involve both psychological

Prologue of ToleranceHendrik Willem Van LoonHappily lived Mankind in the peaceful Valley of Ignorance.To the north, to the south, to the west and to the east stretched the rid...

Essays written by Van Loon are always eazy to learn but with profound meanings in them, Tolerance is one of his most influential writings, it might be deeply rooted in the hea...