| 100% | EVEREST | 7 | It was first conquered in 1953 |
| 79% | MATTERHORN | 10 | It was first conquered in 1865 |
| 68% | MOUNTEVEREST | 12 | It was conquered in 1953 |
| 64% | DNA | 3 | It was first correctly modeled in ''Nature'' (1953) |
| 59% | HYDROGENBOMB | 12 | It was first tested in 1952 |
| 59% | MTMCKINLEY | 10 | It was first climbed in 1913 |
| 59% | 4MINUTEMILE | 11 | It was first broken in 1954 |
| 59% | NEPTUNE | 7 | It was first observed in 1846 |
| 58% | ATOM | 4 | It was first split at Cambridge in 1932 |
| 57% | EROICA | 6 | It was first publicly performed in Vienna in 1805 |
| 57% | OTHELLO | 7 | It was first performed at Whitehall Palace in 1604 |
| 57% | BOYSENBERRY | 11 | It was first cultivated in California by Walter Knott |
| 56% | FATHERSDAY | 10 | It was first officially designated in a 1966 Lyndon Johnson proclamation |
| 53% | RAMADA | 6 | Its first hotel was in Flagstaff |
| 53% | IKEA | 4 | Its first store was in Älmhult |
| 52% | IKEA | 4 | Its first store was in Älmhult, Smaland |
| 52% | AIRMAIL | 7 | Its first stamps were issued in 1918 |
| 52% | RADIO | 5 | It was used to play music for the first time in 1906 |
| 52% | TRIPLELUTZ | 10 | Donald Jackson was first to land it in international competition |
| 51% | OED | 3 | Its first complete ed. was published in 1928 |
| 51% | OED | 3 | Its first vol., A-Ant, was published in 1884 |
| 51% | WHITEHOUSE | 10 | Its first radio was installed by Harding in 1922 |
| 50% | SNL | 3 | Its first host, in 1975, was George Carlin: Abbr. |
| 50% | TEA | 3 | England first bagged it in 1953 |
| 49% | THEROBE | 7 | 1953 Biblical epic that was the first film released in CinemaScope |
| 49% | STEREO | 6 | "Fantasia" was the first commercial film shown in it |
| 48% | SNL | 3 | Tina Fey was its first female head writer, in brief |
| 48% | BIGBEN | 6 | Its chimes were first heard on the BBC in 1923 |
| 47% | MILE | 4 | Roger Bannister was the first to run it in under four minutes |
| 46% | ERNANI | 6 | Verdi work that was the first opera to be recorded in its entirety |