| Cast of characters in "The Big Bang Theory |
| Computer pioneer Lovelace (woo-hoo, women in tech!) |
| Anatomical fissures |
| Atomic number 44 symbol |
| Anatomical cavity |
| Anatomical sacs |
| Autosuggestion pioneer: 1857–1926 |
| Electric guitar pioneer Fender |
| Pioneering underground publication of the 1960s |
| Involving practical participation rather than theory |
| A doctrine or theory |
| Ambient pioneer Brian |
| Smith who wrote The Theory of Moral Sentiments |
| Anatomical rupture |
| Photography pioneer Louis |
| Aspirin pioneer Hoffmann |
| Ambient music pioneer who composed the "Microsoft Sound" for Windows 95: 2 wds. |
| Pioneering child care author |
| Anatomical projection |
| Pharmaceutical pioneer Lilly |
| Sheldon's buddy on "The Big Bang Theory |
| Anatomical loop |
| Abstract art pioneer Jean |
| Massage therapy pioneer Ida |
| Anatomical parts that touch, as eyelids to eyeballs |
| Anatomical rings |
| Automobile pioneer Gottlieb |
| Agricultural pioneer |
| Pioneering web portal |
| Noble gas, atomic number 18 |