Teacher silueta 8 months 5 Teacher silueta 8 months 4 Teacher with Desk silueta 11 months 8 Leader silueta 11 months 2 Speaker at podium silueta 11 months 5 Einstein silueta about 1 year 3 Loud Speaker silueta about 1 year 4 Male Teacher silueta about 1 year 2 Professor silueta about 1 year 2 Woman Teacher silueta about 1 year 3 (Gwen) Office Lady is Making a Presentation silueta about 1 year 0 Teacher Man silueta about 1 year 2 Biology teacher silueta about 1 year 13 Medical Doctor is Presenting at the White Board silueta about 1 year 2 Microphone in Hand silueta about 1 year 0 Microphone Plugged into a Speaker silueta about 1 year 1 Speakers silueta about 1 year 0