| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| "DEFCON" with this number means the military is at maximum readiness | 1 | $800 | DJ | MILITARY SCIENCE | 1999-06-22 | #3422 | |
| Speeds are subsonic below or supersonic above this Mach number | 1 | $300 | J | SCIENCE | 1987-09-22 | #697 | |
| Number of points where a tangent line touches a curve | 1 | $800 | DJ | SCIENCE | 1985-05-16 | #179 |