Worldwide, too little iodine in the diet is the most common cause of hypothyroidism. In countries with enough iodine in the diet, the most common cause of hypothyroidism is the autoimmune condition Hashimoto's thyroiditis.
The pronghorn is the second fastest land mammal in the world, after the cheetah. It can attain speeds of over 53 miles (86 kilometers) per hour. Size relative to a 6-ft (2-m) man: Fleet-footed pronghorns are among the speediest animals in North America. They can run at more than 53 miles (86 kilometers) an hour, leaving pursuing coyotes and bobcats in the dust.
The average speed for a horse is around 40 miles, which is about 64 kilometers an hour. Horses are pretty fast creatures and can got pretty far in an hour, that is without any weigt from a person :).The top speed for a horse is the gallop, which can reach as fast as 45 mph in a Thoroughbred in top condition.Quarter Horses have been known to sprint up to 55mph for a VERY short time. An avergae gallop is 35mph. A racehorse (Thouroghbredor TB) can run up to 45mph.he top speed for a horse is the gallop, which can reach as fast as 45 mph in a Thoroughbred in top condition. Quarter Horses have been known to sprint up to 55mph for a VERY short time.