8. Theodore Roosevelt
Source: Wikipedia.
Theodore Roosevelt became the 26th and youngest president in the nation’s history at the age of 43. He had an IQ of 149, according to Simonton’s estimates.
Roosevelt graduated Phi Beta Kappa from Harvard in 1880, according to the White House. He then went to Columbia to study law, which he disliked and found to be irrational. Instead of studying, he spent most of his time writing a book about the War of 1812. Roosevelt dropped out to run for public office, ultimately becoming a two-term President best known for his motto: “Speak softly and carry a big stick.”