| Clue | Source | Date |
|---|---|---|
| Minimal weight of octogenarian strippeuse? | The Telegraph Toughie | 14 Jul 2022 |
| Established norm again discounted by one in mass, one in a billion | ||
| Fellow getting hold of gas coming up with a very small amount | ||
| One-trillionth of a kilo | New York Times | 07 Apr 2015 |
| One-trillionth of a kilo |