| Answer | Crossword Clue |
|---|---|
| SARAJEVO | Where W.W. I was set off |
| SOMME | W.W. I battle site at which the tank was introduced |
| AISNE | French river that was the site of three W.W. I battles |
| EASTERNAIRLINES | Its first C.E.O. was the W.W. I hero Eddie Rickenbacker |
| MOMA | Where "Guernica" was hung during W.W. II |
| quaternion | A complex number of the form w + xi + yj + zk, where w, x, y, z are real numbers and i, j, k are imaginary units that satisfy certain conditions |
