1. John Quincy Adams – 175
John Quincy Adams, the eldest son of the second president John Adams, emerged victorious in the 1824 election, becoming the sixth President of the United States. Notably, Adams possessed an extraordinarily high IQ, which undoubtedly aided him in his presidential duties. His intellectual prowess extended beyond English, as he was fluent in Dutch, French, and German. Adams also attended Harvard University, a testament to his exceptional intellect. The history of American presidents reveals a notable trend of intellectual brilliance, as observed by Professor Simonton. However, history class might not have uncovered some of the intriguing secrets, scandals, and bizarre incidents surrounding these leaders, which are often left untold.