The right side of your cerebellum controls coordination on the right side of your body; the left side of your cerebellum controls coordination on the left. Diseases that damage the spinal cord and peripheral nerves that connect your cerebellum to your muscles also can cause ataxia. Ataxia causes include: Head trauma. Damage to your brain or spinal cord from a blow to your head, such as might occur in a car accident can cause acute cerebellar ataxia, which comes on suddenly. Stroke. When the blood supply to a part of your brain is interrupted or severely reduced, depriving brain tissue of oxygen and nutrients, brain cells die.
A polar bear has one of the best noses in the entire world and are well known to have an incredible sense of smell. Polar bears have been seen walking in a straight line for 32km (20 miles) to food, with only their nose to guide them. Polar bears have also sniffed out a seal ten football fields away that was hidden under 1m (3') of ice.
Polar bears were once thought to be aimless wanderers, but scientists now believe that, like other members of the bear family, many of them have distinct territories, or home ranges. After leaving their mothers, young polar bears may travel more than 1,000 kilometers / 600 miles to establish their own territory. It appears that the size of a polar bear's range is determined by the amount of available food. Bears living in areas with an abundance of ice and seals have smaller home ranges. A satellite-tracked polar bear surprised researchers with a 3,000 mile / 4,800 km trek.