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.
5 to 8 ft (1.5 to 2.5 m). Weight: 800 lbs (363 kg). Protection status: Threatened. Size relative to a 6-ft (2-m) man: The grizzly bear is a North American subspecies of the brown bear. These awe-inspiring giants tend to be solitary animalsâwith the exception of females and their cubsâbut at times they do congregate. to 8 ft (1.5 to 2.5 m). Weight: 800 lbs (363 kg). Protection status: Threatened. Size relative to a 6-ft (2-m) man: The grizzly bear is a North American subspecies of the brown bear. These awe-inspiring giants tend to be solitary animalsâwith the exception of females and their cubsâbut at times they do congregate.