| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| A law discovered by Galileo let Christian Huygens in 1656 make an accurate clock using one of these | a pendulum | $1,200 | DJ | GRAB BAG | 2003-12-03 | #4428 | |
| In 1656 Christiaan Huygens added this to a clock to control the escapement | a pendulum | $600 | DJ | ODDS & ENDS | 1993-12-24 | #2145 |