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
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
ms pan man writing chinese characters on blackboard / singapore - blackboard visual aid stock videos & royalty-free footage00:12
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
black ink brush paint stroke transition - blackboard visual aid stock videos & royalty-free footage00:12
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
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
female trainer drawing diagram on blackboard during training - blackboard visual aid stock videos & royalty-free footage00:13
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
hand sketched grunge noise random cartoon shapes textured background in stop motion stock video - blackboard visual aid stock videos & royalty-free footage00:07
scientist robert goddard writes an equation on a chalkboard. - blackboard visual aid stock videos & royalty-free footage00:22
instructor teaching mathematics to elementary age students - blackboard visual aid stock videos & royalty-free footage00:11
person, hands and writing on glass board in schedule planning, brainstorming or tasks at the office. closeup of employee in project plan, agenda or reminder for company goals or mission at workplace - blackboard visual aid stock videos & royalty-free footage00:06
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
highlight round marking text ink brush circle stock video - blackboard visual aid stock videos & royalty-free footage00:09
view through transparent board of hand writing chemical equation on board - blackboard visual aid stock videos & royalty-free footage00:17
cu hand writing a math equation on black chalkboard - blackboard visual aid stock videos & royalty-free footage00:33