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.
How fast is the 1968 Ford Mustang Shelby GT 390 fastback? The 1968 Ford Mustang Shelby GT 390 Fastback has a top speed of 130 miles per hour and accelerates from zero to 60 mph in 6.2 seconds. The car achieves this performance with its high-power engine and lightweight body.