| 100% | ATOMICAGE | 9 | Period spawned by the Manhattan Project |
| 79% | AEC | 3 | Agcy. spawned by the Manhattan Project |
| 64% | ATOMIC | 6 | Bomb developed by the Manhattan Project |
| 46% | AEC | 3 | Agcy. created after the Manhattan Project |
| 46% | TOPSECRET | 9 | Like the Manhattan Project |
| 46% | ATOMICAGE | 9 | It followed the Manhattan Project |
| 46% | ABOMB | 5 | Result of the Manhattan Project |
| 46% | NIELS | 5 | Bohr of the Manhattan Project |
| 46% | UREY | 4 | Harold of the Manhattan Project |
| 45% | ABOMB | 5 | Focus of the Manhattan Project, briefly |
| 45% | ANTINUKE | 8 | Opposed to the Manhattan Project, say |
| 44% | FRISCH | 6 | Otto who worked on the Manhattan Project |
| 42% | BRONZEAGE | 9 | Period marked by the smelting of copper |
| 42% | GOLDENAGE | 9 | Period followed by the silver and bronze eras |
| 39% | ANCHORAGE | 9 | Period dominated by the likes of Dan Rather and Peter Jennings? |
| 38% | COLOSSEUM | 9 | Project begun by the emperor Vespasian |
| 35% | YEAR | 4 | Time period for one revolution around the Sun by Earth |
| 35% | BOYS | 4 | Song by Lizzo that featured in the period drama "Dickinson" |
| 35% | ENE | 3 | Peruvian river that would have been dammed by the massive Pakitzapango hydroelectric project, since cancelled |
| 33% | VINYL | 5 | Period drama TV series co-created by Mick Jagger that follows the '70s music scene |
| 33% | ABOMB | 5 | Manhattan Project project |
| 32% | ATESTS | 6 | Manhattan Project projects |
| 32% | URANIUM | 7 | Manhattan Project element |
| 32% | UREY | 4 | Manhattan Project scientist |
| 32% | ABOMB | 5 | Manhattan Project result |
| 32% | FERMI | 5 | Manhattan Project VIP |
| 32% | LAPP | 4 | Manhattan Project physicist |
| 32% | FERMI | 5 | Manhattan Project scientist |
| 32% | FERMI | 5 | Manhattan Project physicist |
| 32% | ABOMB | 5 | Manhattan Project product |