doctor in white lab coat standing at blackboard pointing at curve on graph/ men in suits sitting at conference table/ audio - blackboard visual aid stock videos & royalty-free footage00:16
men and women listen to chemistry lecture from teacher; 1956 - blackboard visual aid stock videos & royalty-free footage00:06
professor writing on blackboard (timelapse) - blackboard visual aid stock videos & royalty-free footage00:20
professor writing on blackboard (timelapse) - blackboard visual aid stock videos & royalty-free footage00:30
one thing they have in common is ambition - blackboard visual aid stock videos & royalty-free footage00:05
disembodied hands, on holding red pencil, the other strip of film; man with large moustache looks at strip of film and asks man at chalkboard holding... - blackboard visual aid stock videos & royalty-free footage01:02
1970 ms montage teacher speaking in front of chalkboard and pulling down screen, man starting movie projector, los angeles, california, usa, audio - blackboard visual aid stock videos & royalty-free footage00:06
ms pan man writing chinese characters on blackboard / singapore - blackboard visual aid stock videos & royalty-free footage00:12
prince charles and princess diana nigeria and cameroon tour: day 6; cameroon: yaounde: school for the deaf: int diana, princess of wales into... - blackboard visual aid stock videos & royalty-free footage04:04
schoolchildren and teacher solving mathematics problems - blackboard visual aid stock videos & royalty-free footage00:52
russian biochemist, alexander oparin, speaking in front of blackboard / american chemist, stanley miller, conducting experiment in flask with... - blackboard visual aid stock videos & royalty-free footage01:30
black ink brush paint stroke transition - blackboard visual aid stock videos & royalty-free footage00:12
they're always developing new ways to reach success - blackboard visual aid stock videos & royalty-free footage00:10
sequence showing three close-up shots of a middle-aged man drawing the axis of a simple graph with chalk onto an old-fashioned, free-standing blackboard, uk. - blackboard visual aid stock videos & royalty-free footage00:20
hand sketched grunge noise random cartoon shapes textured background in stop motion stock video - blackboard visual aid stock videos & royalty-free footage00:07
ms young woman writing mathematical formula on blackboard / singapore - blackboard visual aid stock videos & royalty-free footage00:08
b/w 1940s/50s man lecturing at chalkboard / pan to audience of businessmen + men in white uniforms - blackboard visual aid stock videos & royalty-free footage00:18
latin american teacher explaining an experiment on white board to chemistry students while they pay close attention - blackboard visual aid stock videos & royalty-free footage00:13
cu pan td mathematical formula being wrote on blackboard / singapore - blackboard visual aid stock videos & royalty-free footage00:08
cu young business woman turning and smiling / singapore - blackboard visual aid stock videos & royalty-free footage00:15
diverse team brainstorming for ideas - blackboard visual aid stock videos & royalty-free footage00:26
coach explaining strategies to his soccer team on whiteboard - blackboard visual aid stock videos & royalty-free footage00:15
profile view close-up sequence showing the hand of a middle-aged man with a watch writing illegibly with chalk on an old-fashioned blackboard in a room lit with natural light, uk. - blackboard visual aid stock videos & royalty-free footage00:18
small business start up team: briefing with notes - blackboard visual aid stock videos & royalty-free footage00:17
time lapse of traffic at night with blank advertising billboard green screen. - blackboard visual aid stock videos & royalty-free footage00:14
business man writing, planning and glass board for brainstorming, math and statistics analysis or solution. professional asian person with numbers, data analytics and ideas for problem solving in job - blackboard visual aid stock videos & royalty-free footage00:07
zoom in close up man writing equations on chalkboard - blackboard visual aid stock videos & royalty-free footage00:06
close up of hands writing on cahlk board - blackboard visual aid stock videos & royalty-free footage00:10
black ink brush paint stroke transition - blackboard visual aid stock videos & royalty-free footage00:12
figuring out all his big plans for great success - blackboard visual aid stock videos & royalty-free footage00:11
stock market chart,stock market data - blackboard visual aid stock videos & royalty-free footage00:10
these ideas will lead me straight to success - blackboard visual aid stock videos & royalty-free footage00:04
business man, planning and writing on glass board or window for coding, math and formula solution at tech company. young professional drawing numbers, problem solving and information technology idea - blackboard visual aid stock videos & royalty-free footage00:12
4k footage time lapse long exposure of crowded commuter tourist walking in amsterdam schiphol airport at rush hour, amsterdam, netherlands - blackboard visual aid stock videos & royalty-free footage00:07
businesswoman write traget on wall with post-it sticky note in office - blackboard visual aid stock videos & royalty-free footage00:21
hand sketched grunge noise random cartoon shapes textured background in stop motion stock video - blackboard visual aid stock videos & royalty-free footage00:07
white ink brush on black background, paint stroke transition - blackboard visual aid stock videos & royalty-free footage00:12
hand sketched grunge noise random cartoon shapes textured background in stop motion stock video - blackboard visual aid stock videos & royalty-free footage00:07
airport depature board writes cancelled in 4k resolution - blackboard visual aid stock videos & royalty-free footage00:10
drawing straight line transition, ink brush paint stroke - blackboard visual aid stock videos & royalty-free footage00:12
business people, planning and board for idea, strategy or problem solving with corporate team. diversity, meeting and group of professional men and women in discussion for solution, vision or project - blackboard visual aid stock videos & royalty-free footage00:15
female trainer drawing diagram on blackboard during training - blackboard visual aid stock videos & royalty-free footage00:13
hand sketched grunge noise random cartoon shapes textured background in stop motion stock video - blackboard visual aid stock videos & royalty-free footage00:07
instructor teaching mathematics to elementary age students - blackboard visual aid stock videos & royalty-free footage00:11
hand sketched grunge noise dirt scratch random cartoon shapes textured background in stop motion - blackboard visual aid stock videos & royalty-free footage00:10
hand sketched grunge noise random cartoon shapes textured background in stop motion stock video - blackboard visual aid stock videos & royalty-free footage00:07
close-up of the hand of a middle-aged man plotting a graph to show the relative speed at which the planets in our galaxy travel around the sun relative to the distance of their orbits from the sun (m equals mercury, v equals venus etc.) with chalk. - blackboard visual aid stock videos & royalty-free footage00:17
multiracial colleagues brainstorm do in creative thinking in office. - blackboard visual aid stock videos & royalty-free footage00:10
business woman writing on a whiteboard in an office. trendy young manager or worker using a marker board to plan new strategy, brainstorm ideas and do financial management for a creative project - blackboard visual aid stock videos & royalty-free footage00:05
ms young woman standing after writing mathematical formula on blackboard / singapore - blackboard visual aid stock videos & royalty-free footage00:06
view through transparent board of hand writing chemical equation on board - blackboard visual aid stock videos & royalty-free footage00:17
scientist robert goddard writes an equation on a chalkboard. - blackboard visual aid stock videos & royalty-free footage00:22
zoom in female teacher writing arithmetic problems on chalkboard in classroom as children raise hands - blackboard visual aid stock videos & royalty-free footage00:06
cu male hand erasing chinese characters on blackboard / singapore - blackboard visual aid stock videos & royalty-free footage00:12