| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| The buildup of this insecticide in some birds & fish led to its restriction in 1972 | DDT | $200 | DJ | SCIENCE | 1991-10-30 | #1648 | |
| Paul Muller won a Nobel Prize for developing the insecticide known by this 3-letter name | DDT | $400 | DJ | MEN OF SCIENCE | 1991-01-15 | #1472 |