| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| MIT, NASA & others combined to work on the Daedalus Project, to make an airplane powered by this | human power | $300 | J | TRANSPORTATION | 1988-09-23 | #930 | |
| The aircraft Leonardo da Vinci designed all relied on this power source | human power | $400 | DJ | AVIATION | 1986-10-09 | #479 |