Andrew Jackson was the seventh president of the United States of America, serving from 1829 to 1837. He was also a living testament to how Badass a man can be (although Theodore Roosevelt certainly would argue with that statement).
Sharks have a layer of crystals located behind their retinas called the tapetum lucidum that allows them to see around 10 times better than a human in low light. However, their depth is limited, as sharks can only see clearly about 50 feet ahead.