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.
Iâm going to share some of the most fantastic grizzly bear facts for kids. The grizzly bear (Ursus arctos horribilis) also called silvertip bear inhabits all throughout North America, is a subspecies of brown bear. Brown bears are usually found in the western side of North America. The average lifespan of grizzly bears is 20 â 25 years even some species are expected to survive up to 30 years. 2  As compared to black bears, grizzly bears are slightly more aggressive when it comes to defending their territories.