Dr Know
Rare6.8%ObjectiveOptional
Train a World-Class Researcher
Same as Jung at Heart and
Cut Above but for Research. This means all 5 skill slots all on research. Make sure to hire someone either with no skills or just with research; then keep working and training them as soon as they come up for training. You'll likely have to grind this out in a level a ways after getting 3 stars in it.