Deepest Secrets of the Medical Art
When the famous Dutch physician and chemist Hermann Boerhaave died in 1738, he left behind a sealed book entitled The Onliest and Deepest Secrets of the Medical Art. The book was auctioned for a vast quantity of gold. When the new owner broke the seal, he was surprised to find that 99 of its 100 pages were blank. Only the title page bore a handwritten note from the author: "Keep your head cool, your feet warm, and you'll make the best doctor poor."