| 100% | ATS | 3 | ___-6, the world's first educational satellite, launched May 30, 1974 |
| 49% | RCA | 3 | Co. that launched the world's first communications satellite |
| 46% | SPUTNIK | 7 | The world's first constructed satellite |
| 36% | HAITI | 5 | The world's first Black-led republic |
| 34% | ALI | 3 | Sports Illustrated's Sportsman of the Year in 1974 (10 years after he first became world champion) |
| 34% | LONDON | 6 | Site of the world's first subway |
| 34% | NAPLES | 6 | Site of the world's first pizzeria |
| 34% | YELLOWSTONE | 11 | The world's first national park, located in Wyoming, Montana, and Idaho |
| 33% | HATH | 4 | Verb in the world's first telegraph message |
| 33% | SEIKO | 5 | Maker of the world's first quartz watch |
| 33% | NEWHAVEN | 8 | City with the world's first telephone directory (1878) |
| 33% | NIHAO | 5 | "Hello," in the world's most common first language |
| 33% | TELETHON | 8 | Milton Berle hosted the world's first one |
| 33% | SNUPPY | 6 | Afghan hound, the world's first cloned dog |
| 33% | SMALLPOX | 8 | Disease eradicated by the world's first vaccine |
| 32% | HBO | 3 | World's first TV channel to be transmitted via satellite |
| 32% | BOSTON | 6 | Site of the world's first city marathon in 1897 |
| 32% | MERCEDESBENZ | 12 | Maker of the world's first diesel-powered passenger car |
| 32% | SNEAD | 5 | Member of the first class of World Golf Hall of Fame inductees, 1974 |
| 32% | MANNHEIM | 8 | Where Karl Benz debuted the world's first auto |
| 32% | OWEN | 4 | ___ Hurcum, the world's first openly nonbinary mayor |
| 32% | ASIA | 4 | 30% of the world's land |
| 31% | UCLA | 4 | SoCal school where the world's first internet transmission was made |
| 31% | LOUISE | 6 | __ Brown, the world's first IVF baby, born in 1978 |
| 31% | TULIP | 5 | Flower that caused the world's first economic bubble in the 1630s |
| 31% | OPEL | 4 | Automotive company that conducted the world's first rocket-powered flights |
| 30% | NINE | 4 | Cost in dollars of the world's first TV ad in 1941 |
| 30% | FUN | 3 | First Across word in the world's first crossword |
| 30% | TULIP | 5 | Flower that created the world's first speculative bubble, during the Dutch Golden Age |
| 30% | FUN | 3 | First word across in the world's first crossword (1913) |