- Everything puzzle books continue to be category leaders - Perfect for Games promotions! Puzzle: A doctor mixed a batch of medicine for his client and then drank it down himself. Why? Clues: 1. It tasted good! 2. It worked better with a straw. Solution: Coca-Cola was invented when a doctor was mixing headache medication to taste good. The approval board found that the medicine tasted better than it worked, so they carbonated the liquid and then marketed it! With puzzles organized by subject matter, helpful clues for the beginner, and new challenges for the expert, The Everything Lateral Thinking Puzzles Book is sure to be a hit with every puzzler.