View full lesson here: http://ed.ted.com/lessons/mark-salata-how-taking-a-bath-led-to-archimedes-principle Stories of discovery and invention often begin with a problem that needs solving. Summoned by the king to investigate a suspicious goldsmith, the early Greek mathematician Archimedes stumbles upon the principle that would make him famous. Lesson by Amdon Consulting's Mark Salata, animation by TED-Ed.