Theodore Roosevelt
After William McKinley’s assassination, then 42-year-old Theodore Roosevelt became the youngest president in American history. Roosevelt’s strong policies and enthusiasm made him a force to be reckoned with. Considering he had an IQ of 153, would you be brave enough to challenge his brain cells? This one’s interesting: At Harvard University, Theodore Roosevelt tried his hands at boxing and enjoyed this activity so much that he continued it throughout his service at the White House.