| Answer | Crossword Clue |
|---|---|
| XRAYS | Roentgen discovered them |
| YAHOOS | Gulliver discovered them |
| OPALS | NASA discovered them on Mars in 2008 |
| Answer | Crossword Clue |
|---|---|
| XRAYS | Roentgen discovered them |
| YAHOOS | Gulliver discovered them |
| OPALS | NASA discovered them on Mars in 2008 |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.