Related Clues:
- Phys. or chem., e.g.
- Bug planter
- Subj. with projects
- Ecol. or agric.
- Do undercover work
- Subj. that may have a lab
- Plotted plant?
- Geol. or chem
- CIA sort
- Agent 'embedded' in this puzzle's theme answers
- Work under cover, in a way
- Invisible ink user
- It's not always exact: Abbr.
- Asimov subj.
- "Nova" subj.