| Answer | Crossword Clue |
|---|---|
| MERGER | The AFL-CIO was formed by one |
| OPERA | "Genoveva" was the only one written by Robert Schumann |
| SPACEWALK | The first one was performed by Aleksei Leonov on 3-18-1965 |
| TESTBANTREATY | Though not yet in force, one was adopted by the UN in 1996 |
| NOVA | The first recorded one was noted by the Greek scientist Hipparchus in 134 B.C. |
