Stations of the Cross | Lucky Number Slevin | Reynolds number | Mach number | serial number | Random number generation | Official Handbook of Stations | International Standard Book Number | prime number | Personal identification number | number | United Stations Radio Networks | Two in a Million/You're My Number One | Social Security number | Rikki Don't Lose That Number | Prime number | Premium-rate telephone number | Jackass Number Two | Opus number | Number Girl | List of WTA number 1 ranked players | Lah number | Erdős number | Emergency telephone number | Betti number | You're My Number One | What's Your Number? | United States Coast Guard Air Stations | The Number 23 | The Murderer Lives at Number 21 |
Other mysteries explored in the series include Mount Weather, the number stations, backmasking on records, the secrets of Scientology, the true identities of The Residents, the initiation rites of the Freemasons and of college fraternities, anti-counterfeiting devices on money and documents, and the magic of David Copperfield.