From the 1920s to the 1950s, behavioral psychology dominated much of psychological thought, but the cognitive revolution of the 1950s revealed cracks in the theories of the radical behaviorists, and cognitive psychology eventually managed to gain the upper hand.
The heavyweight division in mixed martial arts (MMA) generally groups fighters between 205 and 265 lb (93 and 120 kg). Although many ambiguities exist within the lower weight classes regarding division naming and weight limits, the Heavyweight division is, for the most part, uniform.
Undisputed world heavyweight champion Wladimir Klitschko wants to become first boxer in history to hold all four major titles. Photo: Wladimir Klitschko (L) hopes to make history by unifying all four heavyweight boxing belts.