For example,  when we are watching a scary movie and we can feel very scared even  though we are not even in danger. Even when we thing we have seen  something, for example, a ghost, when we really haven't. So the  answer is: the human brain is the most powerful thing on the earth. Christopher Gerstle.
The grizzly bear is a North American subspecies of the brown bear that once roamed the Great Plains.oday, only about 1,000 grizzlies remain in the continental U.S. Identifiable by its distinctive hump and the grayish, or grizzled, tips of its fur, the mighty grizzly bear has a terrific sense of smell and can run at speeds of up to 30 miles per hour.
The Mexican grizzly bear (Ursus arctos) is a extinct population of the Brown bear. All grizzly bears are brown bears.Only the notable distinctions of this population from other populations are discussed here. The holotype was shot by H. A. Cluff at Colonia Garcia, Chihuahua in 1899.he Mexican grizzly bear was smaller than the grizzly bears in the United States and Canada. The general color was pale buffy yellowish varying to grayish-white, grizzled from the darker color of the underfur.