1. INTRODUCTION
2. DATA & METHODS
2.1. ZFOURGE Imaging Catalogs
2.2. Keck/MOSFIRE Spectroscopy
3. RESULTS
3.1. Strong [O III]5007 Å Emission
3.2. Rest-frame UVJ Colors
3.3. Star-Formation Rate vs. Stellar Mass
3.4. Galaxy Size vs. Stellar Mass
3.6. Kinematics
3.7. Star Formation or Active Galactic Nuclei?
4. DISCUSSION
4.1. Strong [O III]5007 Å Emission May Be Common in Early Galaxy Formation
4.2. A Potential Source of Ionizing UV Photons
5. CONCLUSIONS