Professor teaching in a lecture hall

1920 × 1080

Professor teaching in a lecture hall

1600 × 1200

Teacher instructing students in a classroom

1920 × 1306

Doctor with patients in clinic

1920 × 1200

Science illustration with scientists

1366 × 768

Soldiers in training exercise

1023 × 684

man holding chalk in front of blackboard

2560 × 1440

Doctor with patients in clinic

5616 × 3744

Hand holding a mannequin hand

950 × 662

woman writing on chalkboard

1920 × 1200

Professor teaching in a lecture hall

1600 × 1000

Community cast photo

2560 × 1440

Protesters with historical photo

1000 × 906

hospital staff group photo

1600 × 1200

Marine Recruits Posing

1532 × 949

Anatomical heart drawings

2274 × 2103

Manhattan Bridge under Construction — Black, Historical

1920 × 1200

German officer in uniform

842 × 1061

Military Aircraft in Flight — Black, Aerial

1679 × 1200

woman in traditional attire

1920 × 2708