| Answer | Crossword Clue |
|---|---|
| NUCLEARREACTION | Scientific phenomenon. |
| discoverers | The first person to find or observe a substance or scientific phenomenon |
| discoverer | The first person to find or observe a substance or scientific phenomenon |
| discovering | Be the first to find or observe (a place, substance, or scientific phenomenon) |
| discovers | Be the first to find or observe (a place, substance, or scientific phenomenon) |
| discovered | Be the first to find or observe (a place, substance, or scientific phenomenon) |
