| 100% | NOVA | 4 | The first recorded one was noted by the Greek scientist Hipparchus in 134 B.C. |
| 36% | VCR | 3 | The first commercial one of these was introduced by Ampex in 1956 and cost roughly $50,000 |
| 35% | WAR | 3 | The first recorded one was between Sumer and Edam |
| 35% | JEWOF | 5 | & 9D The —, drama in blank verse by Christopher Marlowe whose first recorded performance was in 1592 |
| 35% | ATOMICPILE | 10 | The first one of these was built by Fermi and his team in 1942 |
| 34% | HOPPER | 6 | Scientist and naval officer Grace ___ who was one of the first three pioneers in computer programming |
| 33% | OLYMPICS | 8 | The first modern one was held in Athens in 1896 |
| 32% | BOHR | 4 | Noted scientist who was conferred the "Order of the Elephant" by Denmark's King Frederick IX in 1947 |
| 32% | OLYMPIC | 7 | The first modern one of these games was in Greece |
| 32% | MASON | 5 | Elizabeth Aldworth was the first recorded female one |
| 32% | WIZARD | 6 | In the story, Oz is run by one |
| 32% | WORD | 4 | The first one in this clue is "The" |
| 32% | PETE | 4 | I became the number one tennis player in 1993 and my record of 14 Grand Slams was surpassed by Federer in 2009 |
| 32% | TEDTALK | 7 | The first one was delivered in 1984 |
| 32% | EMAIL | 5 | The first one was sent in 1971 |
| 31% | LYRIC | 5 | "In the town where I was born / Lived a man who sailed to sea" is the first one in "Yellow Submarine," by the Beatles |
| 31% | ISP | 3 | "The World" in Mass. was the first commercial one, in '89 |
| 31% | BROWSERWAR | 10 | Navigator was in the first one |
| 31% | IBIS | 4 | One of the first birds released by Noah after the flood, in legend |
| 31% | ALMANAC | 7 | The first one printed in America was in 1639 |
| 31% | SSN | 3 | The first one was issued in 1936, for short |
| 31% | PLAN | 4 | ___ B is for when the first one fails |
| 31% | EGYPT | 5 | Where the use of urine-based pregnancy tests was first recorded, circa 1350 B.C.E. |
| 31% | ROME | 4 | First city to reach a population of one million people, in the second century B.C. |
| 31% | RABBI | 5 | The first ordained female one was Regina Jonas in 1935 |
| 30% | STATEPARK | 9 | Niagara Reservation was the first one in 1885 |
| 30% | IDS | 3 | "Real" ones were first issued in the 2010s |
| 30% | EVESDIARY | 9 | Mark Twain tale narrated in the first person by a noted first woman |
| 30% | ERNANI | 6 | Verdi work that was the first opera to be recorded in its entirety |
| 30% | SAINT | 5 | Ulrich was the first one created by a pope |