CALTECH
| Date | Clue |
|---|---|
| 2022-02-26 | West Coast school where Einstein once taught |
| 2016-01-29 | Prestigious Pasadena institution |
| 2013-05-07 | West Coast engineering institution, informally |
| 2010-06-06 | Prestigious West Coast school, for short |
| 2001-09-09 | Jet Propulsion Lab site |
| 1999-09-12 | Jet Propulsion Laboratory site |
| 1996-09-20 | Operator of the Palomar Observatory |