The World's 200 Hardest Brain Teasers Quotes

“5.     An explorer found a silver coin marked 7 BC. He was told it was a forgery. Why?”
― Gary R. Gruber, The World's 200 Hardest Brain Teasers: Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain

“Just remember, a person who can solve problems efficiently either knows a particular strategy for the type of problem or extracts something from the problem that is curious to him or her and that leads to the next step toward a solution.”
― Gary R. Gruber, The World's 200 Hardest Brain Teasers: Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain