User:Bjoern/video transcripts

From OER in Education
Jump to: navigation, search

1 Videos with transcripts

VIDEO

A brainstorm naming animals

A brainstorm naming animals. Start of lesson: brainstorm with unique contributions, time to think first, no hands up technique.

Video/Eness vertebrates 1.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_1.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 2:43 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 01)(Transcript available here or via YouTube captions.)

VIDEO

Students hand out blackboards

Students hand out blackboards themselves (active)

Video/Eness vertebrates 2.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_2.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 1:40 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 02)(Transcript available here or via YouTube captions.)

VIDEO

Teacher repeats and clarifies

Teacher repeats and clarifies instructions; she illustrates them with nonsense classifications so students do not copy hers

Video/Eness vertebrates 4.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_4.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 2:43 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 04)(Transcript available here or via YouTube captions.)

VIDEO

Mini-blackboards group work

Groupwork using mini-blackboards: group of 5 recording under their own category of ‘animals with no legs’ and interacting as a group

Video/Eness vertebrates 6.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_6.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 3:43 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 06)(Transcript available here or via YouTube captions.)

VIDEO

Whole class discussion

Whole class discussion of ‘Is a bat a bird?' Teacher sets unresolved problem as homework

Video/Eness vertebrates 12.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_12.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 4:19 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 12)(Transcript available here or via YouTube captions.)

1.1 New transcripts

Presently being edited on youtube:

VIDEO

Geogebra group work

A group of students jointly progress on their task to investigate the relationship between area and perimeter of rectangles.

Video/Geogebra-group-interaction.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Geogebra-group-interaction.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 2:03 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 06)

VIDEO

Whole class discussion on the meaning of area

Abel questions students on their knowledge and understanding of the concept of area.

Video/Abel Clip 2.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Abel_Clip_2.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 3:08 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 02)

VIDEO

Aggie and class explore lung capacity with a hands-on demonstration using a water bottle

Aggie and her class explore lung capacity and how it varies with height/sex/pulse rate/chest circumference.

Video/Aggie lung capacity.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Aggie_lung_capacity.m4v,This video is available on your memory stick in the video/Aggie Fitness folder.About this video. Duration: 1:47 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Aggie Fitness, episode 01)

VIDEO

Abel demonstrates that a circle has perimeter

Abel helps students to visualise the concept of perimeter of a circle and uses a cylinder to demonstrate how to calculate it.

Video/Abel Clip 3.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Abel_Clip_3.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 2:23 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 03)

2 Abel

VIDEO

Fixed area vs a changing perimeter

Abel demonstrates the concept of a fixed area vs a changing perimeter.

Video/12 13 Abel 2 4 rectangles 1-desktop.m4v, http://oer.educ.cam.ac.uk/wiki/Video/12_13_Abel_2_4_rectangles_1-desktop.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 7:9 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 07)

VIDEO

Group discussion on the formula for finding area of rectangle

Abel questions a group on the formula for area and how to relate it to a rectangle drawn on the netbook.

Video/12 13 Abel 2 4 rectangles 5-desktop.m4v, http://oer.educ.cam.ac.uk/wiki/Video/12_13_Abel_2_4_rectangles_5-desktop.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 2:24 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 15)

VIDEO

Whole class discussion on the meaning of area

Abel questions students on their knowledge and understanding of the concept of area.

Video/Abel Clip 2.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Abel_Clip_2.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 3:08 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 02)

VIDEO

Instructions for the interactive task

Abel starts with whole class dialogue, giving instructions for starting the investigation. (1:16) Abel then works with one of the groups, clarifying the concepts of area and perimeter, as well as how to work with these in Geogebra. The group is still stuck, and (3:30) Abel solicits helps from other students to help this group, asking them to explain details of Geogebra (relating to perimeter and area). (4:11) Students explore Geogebra through peer learning.

Video/Abel Clip 4.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Abel_Clip_4.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 4:32 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 04)

VIDEO

Students presenting work on area and perimeter

Students present outcome of findings of GeoGebra investigation on rectangles with the same area but different perimeters.

Video/Abel Clip 5.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Abel_Clip_5.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 1:21 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 09)

VIDEO

Students collaborate on GeoGebra investigation on area and perimeter

Introduction to group work, then students doing group work. The teacher supports students in group work, but the students find it difficult to follow the teacher's explanations. Towards the end of the clip, the teacher then asks some students to come over, to explain the issue to the group in their own words.

Video/New Abel clip 4.m4v, http://oer.educ.cam.ac.uk/wiki/Video/New_Abel_clip_4.m4v,This video is available on your memory stick in the video/Abel rectangles folder.About this video. Duration: 6:56 (watch on YouTube, local play / download options / download from dropbox)(Series: Abel rectangles, episode 05)


3 Aggie

VIDEO

Observation of small group completing lung capacity worksheet together

Small group working together to discuss and complete lung capacity worksheet

Video/Aggie Fitness A06.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Aggie_Fitness_A06.m4v,This video is available on your memory stick in the video/Aggie Fitness folder.About this video. Duration: 4:35 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Aggie Fitness, episode 06)

VIDEO

Small group discusses how to measure lung capacity displacement

Small group working together to guess lung capacity displacement

Video/Aggie Fitness A07.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Aggie_Fitness_A07.m4v,This video is available on your memory stick in the video/Aggie Fitness folder.About this video. Duration: 1:48 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Aggie Fitness, episode 07)

VIDEO

Group revises original estimates of lung capacity

Small group decides to adjust their guesses on lung capacity

Video/Aggie Fitness A08.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Aggie_Fitness_A08.m4v,This video is available on your memory stick in the video/Aggie Fitness folder.About this video. Duration: 0:51 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Aggie Fitness, episode 08)

VIDEO

Small group discusses how many millilitres are in a litre

Small group discussion on how many millilitres make up a litre

Video/Aggie Fitness A09.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Aggie_Fitness_A09.m4v,This video is available on your memory stick in the video/Aggie Fitness folder.About this video. Duration: 2:36 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Aggie Fitness, episode 09)

VIDEO

Aggie and class explore lung capacity with a hands-on demonstration using a water bottle

Aggie and her class explore lung capacity and how it varies with height/sex/pulse rate/chest circumference.

Video/Aggie lung capacity.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Aggie_lung_capacity.m4v,This video is available on your memory stick in the video/Aggie Fitness folder.About this video. Duration: 1:47 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Aggie Fitness, episode 01)

4 Agness

VIDEO

Agness asks students to discuss why trees shake

Why do trees shake?

Video/Agness Air A02.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Agness_Air_A02.m4v,This video is available on your memory stick in the video/Agness Air folder.About this video. Duration: 1:34 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Agness Air, episode 02)

VIDEO

Agness invites all groups to participate in discussion

Each group gives their answers to question 'why do trees shake?'

Video/Agness Air A03.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Agness_Air_A03.m4v,This video is available on your memory stick in the video/Agness Air folder.About this video. Duration: 1:05 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Agness Air, episode 03)

VIDEO

Agness Air A08

Agness Air A08

Video/Agness Air A08.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Agness_Air_A08.m4v,This video is available on your memory stick in the video/Agness Air folder.About this video. Duration: 3:13 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Agness Air, episode 08)

5 Priscillah

VIDEO

Soil water retention lesson

Priscillah's class explore the water retention properties of soil types

Video/Priscillah Water Soil A04.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Priscillah_Water_Soil_A04.m4v,This video is available on your memory stick in the video/Priscillah Water Soil folder.About this video. Duration: 2:54 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Priscillah Water Soil, episode 04)

6 Eness - no transcript

VIDEO

Is a boy a mammal?

Eness leads a discussion on 'Is a boy a mammal?'

Video/19 Eness 3 vertebrates 10.mp4, http://oer.educ.cam.ac.uk/wiki/Video/19_Eness_3_vertebrates_10.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 3:51 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 10)

VIDEO

Fish or mammal?

Class explores the question 'Is a whale a fish or a mammal?'

Video/19 Eness 3 vertebrates 11.mp4, http://oer.educ.cam.ac.uk/wiki/Video/19_Eness_3_vertebrates_11.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 4:31 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 11)

VIDEO

Instructions to set up the task

Instructions to set up the task and initiate group work. Group enjoying themselves.

Video/Eness vertebrates 3.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_3.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 1:17 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 03)

VIDEO

Teacher gives detailed help

Teacher gives detailed help to group: shows ICT use. ("I've never seen a Zebra.")

Video/Eness vertebrates 5.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_5.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 4:04 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 05)

VIDEO

Teacher interaction

Teacher interacts with group

Video/Eness vertebrates 7.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_7.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 3:46 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 07)

VIDEO

Group presentation

Group presentation: teacher detects error and asks for input from children to verify (rather than ‘telling’); she corrects error with input from class.

Video/Eness vertebrates 8.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Eness_vertebrates_8.mp4,This video is available on your memory stick in the video/Eness Vertebrates folder.About this video. Duration: 7:03 (watch on YouTube, local play / download options / download from dropbox)(Series: Eness Vertebrates, episode 08)

7 Judith

VIDEO

Hand washing enquiry

Pupils investigate different methods of hand washing to identity which is the most efficient.

Video/Judith.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Judith.m4v,This video is available on your memory stick in the video/Judith body folder.About this video. Duration: 3:51 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Judith body, episode 28)

VIDEO

How to use height and weight data to calculate BMI

Judith reiterates the importance of accurate data collection and shows pupils, on the board, how to calculate their BMI. Pupils stick measuring tapes to the wall in preparation for measuring their height.

Video/Judith body A04.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Judith_body_A04.m4v,This video is available on your memory stick in the video/Judith body folder.About this video. Duration: 14:01 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Judith body, episode 04)

VIDEO

Collecting accurate data

Judith shows pupils again how to measure their height accurately, emphasising the importance of using the correct method and paying attention to detail. Using a straight tape measure that starts at the floor (at zero), Marsha measures 1.45m.

Video/Judith body A06.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Judith_body_A06.m4v,This video is available on your memory stick in the video/Judith body folder.About this video. Duration: 1:04 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Judith body, episode 06)

VIDEO

Checking for anomalous results

Judith draws the pupils' attention to differing height measurements for the same pupil. Using this tape measure, Marsha measures 1.29m.

Video/Judith body A07.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Judith_body_A07.m4v,This video is available on your memory stick in the video/Judith body folder.About this video. Duration: 0:51 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Judith body, episode 07)

VIDEO

Collecting data for the BMI enquiry

Judith guides pupils to help each other to discover the source of an error when measuring height.

Video/Judith body A08.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Judith_body_A08.m4v,This video is available on your memory stick in the video/Judith body folder.About this video. Duration: 1:44 (watch on YouTube, local play / download options / download from dropbox) (Video filmed in 2012, at CBS.)(Series: Judith body, episode 08)

VIDEO

Division demonstration and scoring

Judith's lesson: Division demo and scoring

Video/Judith division demo and scoring.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Judith_division_demo_and_scoring.m4v,This video is available on your memory stick in the video/Judith Division folder.About this video. Duration: 12:34 (watch on YouTube, local play / download options / download from dropbox)(Series: Judith Division, episode N/A)

VIDEO

Group discussion on division

Judith's lesson: Group talk on division

Video/Judith division group talk.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Judith_division_group_talk.m4v,This video is available on your memory stick in the video/Judith Division folder.About this video. Duration: 12:34 (watch on YouTube, local play / download options / download from dropbox)(Series: Judith Division, episode N/A)

8 Noxolo

VIDEO

Recording findings

Recording information during an enquiry. Noxolo encourages a group to record their findings. She checks who in the group is supposed to keep the records of the investigation.

Video/Noxolo 3D shapes 1.3 AfL3 recording.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Noxolo_3D_shapes_1.3_AfL3_recording.m4v,This video is available on your memory stick in the video/3D shapes folder.About this video. Duration: 0:40 (watch on YouTube, local play / download options / download from dropbox)(Series: 3D shapes, episode 13)

VIDEO

Assessing understandings

Assessing students' understanding and acting on those observations. Noxolo has observed that the students are struggling with naming shapes. She interrupts the group work to address the issue.

Video/Noxolo 3D shapes 1.3 AfL4 acting on obs.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Noxolo_3D_shapes_1.3_AfL4_acting_on_obs.m4v,This video is available on your memory stick in the video/3D shapes folder.About this video. Duration: 1:10 (watch on YouTube, local play / download options / download from dropbox)(Series: 3D shapes, episode 16)

VIDEO

Checking prior knowledge

Checking learners' prior knowledge. In this clip Noxolo checks the learners' prior knowledge, and probes the students' answers (rather than just telling them right or wrong). Through questioning, she clarifies the learners' understanding.

Video/Noxolo 3Dshapes 1.1 AfL1 prior knowledge.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Noxolo_3Dshapes_1.1_AfL1_prior_knowledge.m4v,This video is available on your memory stick in the video/3D shapes folder.About this video. Duration: 2:11 (watch on YouTube, local play / download options / download from dropbox)(Series: 3D shapes, episode 01)

VIDEO

Introducing a net diagram activity

Introducing an activity. Noxolo is setting up the activity for students to identify which net diagram goes with which and finding the properties of each (faces/vertices/edges).

Video/Noxolo 3Dshapes 1.2-10.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Noxolo_3Dshapes_1.2-10.m4v,This video is available on your memory stick in the video/3D shapes folder.About this video. Duration: 4:45 (watch on YouTube, local play / download options / download from dropbox)(Series: 3D shapes, episode 10)

9 Pindi - Graphs

VIDEO

Helping a learner with questioning

Pindi examines one of the learners pieces of work. The learner has produced a graph that is two small, so Pindi asks questions to help. A small supporting handout is given with the questions on

Video/Pindi Graphs3-10.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_Graphs3-10.mp4,This video is available on your memory stick in the video/Graphs folder.About this video. Duration: 00:37 (watch on YouTube, local play / download options / download from dropbox) Video produced in conjunction with AIMSSEC.(Series: Graphs, episode 06)

VIDEO

Addressing incorrect work

Pindi has stopped the class to quickly address the problem she saw where learners had produced graphs that did not fit correctly on the paper. Learners are encouraged to share ideas and then make alterations

Video/Pindi Graphs3-12.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_Graphs3-12.mp4,This video is available on your memory stick in the video/Graphs folder.About this video. Duration: 00:45 (watch on YouTube, local play / download options / download from dropbox) Video produced in conjunction with AIMSSEC.(Series: Graphs, episode 07)

VIDEO

Explanation of randomly selecting pupils to present

Pindi explains how she will randomly select the pupils using strips of paper which have ticks or crosses on them. Pupils are given two more minutes to ensure that everyone in their group is able to present the work.

Video/Pindi Graphs3-17.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_Graphs3-17.mp4,This video is available on your memory stick in the video/Graphs folder.About this video. Duration: 01:07 (watch on YouTube, local play / download options / download from dropbox) Video produced in conjunction with AIMSSEC.(Series: Graphs, episode 10)

VIDEO

Learner’s graph not quite right

A learner has finished plotting points on their graph and has managed to fit them to the page neatly, however the graph does not quite look correct.

Video/Pindi Graphs3-8a.mp4, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_Graphs3-8a.mp4,This video is available on your memory stick in the video/Graphs folder.About this video. Duration: 00:33 (watch on YouTube, local play / download options / download from dropbox) Video produced in conjunction with AIMSSEC.(Series: Graphs, episode 05)

VIDEO

Teacher allocates group numbers

Teacher allocating group numbers to learners as they enter class

Video/Pindi graphs 3.1-1.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_graphs_3.1-1.m4v,This video is available on your memory stick in the video/Graphs folder.About this video. Duration: 1:42 (watch on YouTube, local play / download options / download from dropbox)(Series: Graphs, episode 1)

10 Pindi - exponentials

VIDEO

Introducing a problem with a story

Pindi introduces the problem ("The powers of two"). She begins the lesson by telling a story. She asks the students which option they would choose: A fixed amount of money, or a smaller amount which doubles every week. Learners give their opinion.

Video/Pindi exponentials 2.1-1.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_exponentials_2.1-1.m4v,This video is available on your memory stick in the video/Exponentials folder.About this video. Duration: 2:35 (watch on YouTube, local play / download options / download from dropbox)(Series: Exponentials, episode 01)

VIDEO

Classroom management

Classroom management. Pindi asks the learners to go to the school hall to continue the investigation.

Video/Pindi exponentials 2.3-18.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_exponentials_2.3-18.m4v,This video is available on your memory stick in the video/Exponentials folder.About this video. Duration: 1:56 (watch on YouTube, local play / download options / download from dropbox)(Series: Exponentials, episode 18)

VIDEO

Whole group work

Pindi asking the groups to come together with their work, so that the work can be compared and discussed.

Video/Pindi exponentials 2.4-21.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_exponentials_2.4-21.m4v,This video is available on your memory stick in the video/Exponentials folder.About this video. Duration: 0:33 (watch on YouTube, local play / download options / download from dropbox)(Series: Exponentials, episode 21)

VIDEO

Graph group work

Group work activity on drawing the graph. Pindi shows the use of the "ruler" to a group.

Video/Pindi exponentials 2.4-23.m4v, http://oer.educ.cam.ac.uk/wiki/Video/Pindi_exponentials_2.4-23.m4v,This video is available on your memory stick in the video/Exponentials folder.About this video. Duration: 1:04 (watch on YouTube, local play / download options / download from dropbox)(Series: Exponentials, episode 23)