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Not Right For WatchKnowLearn
Ages: 11 - 18
Poisoned Waters:  Why Is Stormwater Runoff a Major New Threat?
From teachersdomain.org, produced by PBS
More than three decades after the Clean Water Act, iconic American waterways like the Chesapeake Bay and Puget Sound are in perilous condition and facing new sources of contamination. In this special collection of educational resources from FRONTLINE... [more]
November 1, 2010 at 08:42 PM
Not Right For WatchKnowLearn
Ages: 8 - 14
Alternate Mental Subtraction Method
From YouTube, produced by Sal Khan
In this video, the instructor explains how he uses mental math to subtract two four-digit numbers. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. This video is ... [more]
January 23, 2010 at 03:12 PM
Not Right For WatchKnowLearn
Ages: 12 - 18
One Day on Earth - Trailer
From vimeo.com, produced by Vimeo/onedayonearth.org/screening
This 2:22 preview provides a great many short images of the many different cultures and geography of the world with film taken on the same day. A good way to get students to understand how diverse the planet is and the photography is impressive. This... [more]
April 22, 2012 at 03:50 PM
Not Right For WatchKnowLearn
Ages: 7 - 18
Leafcutter Ants - The First Agriculture
From YouTube
This documentary video is suitable for older elementary, middle school, and high school students and focuses on a colony of leafcutter ants. Run time 06:49.
August 7, 2009 at 02:34 PM
Not Right For WatchKnowLearn
Ages: 11 - 16
Finding the Perimeter of Polygons
From YouTube, produced by Math Made Easy
In this video, the instructor (who goes by the name jediteacher2007) shows several polygons (many-sided figures like hexagons and pentagons), and how to measure the distance around them (perimeter). The instructor uses computer software for instructi... [more]
February 10, 2010 at 08:13 PM