• When does the Third Millennium start? What about the 21st Century? 2000 or 2001?
• Twelve Coins Puzzle: Find the fake using a balance scale:
• Solve: MADE + MEAD = EDAM
• Classic Hotel Room Mystery! Where's the Missing Dollar?
• What came first? The Chicken or the Egg? Answers from Daniel Webster, Pope John 23, Charles Darwin, and me.
• Can you draw four straight lines through nine dots? A few hints.
• How can you measure exactly six quarts of water using only a four quart cylinder and an eight quart cylinder? My answer!
• What Math Tricks can I play on my friends? Here are a few tricks!
• Monty Hall and the Let's Make a Deal puzzle: Should you switch doors?

• Preparing for standardized tests like the SAT, GRE, NTE, etc.

Etcetera

• Some very large number words that your teacher might not know?