In this 1809 letter dated two days before ending his Presidency, Thomas Jefferson said he felt like being released from prison, and that he should've been a scientist

Scientist-President Thomas Jefferson discovered large bones that were initially thought to be from a large cat-like predator, but it was later determined to be from a giant sloth

Perhaps our first scientist-President, Thomas Jefferson in 1784 discussed air travel via balloons, 9 years before Jean Pierre Blanchard flew over Philadelphia in January 9, 1793