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Ages: 10 - 18
Jonas Salk and the Polio Vaccine
From 5min, produced by Britannica
The polio virus attacks certain types of nerve cells and for hundreds of years it killed and crippled - especially children. By 1952 Dr. Salk and his research team had developed a killed virus vaccine against polio. Learn how a nationwide mobilizatio... [more]
Found by begamatt in Scientists
September 3, 2010 at 11:12 PM
Not Right For WatchKnowLearn
Ages: 11 - 18
How to Add Fractions with Different Denominators
From 5min, produced by VideoJug
John, a math teacher, uses a small whiteboard in this short two-minute tutorial to demonstrate how to add fractions with different denominators. The video goes step-by-step and is easy to understand.
April 20, 2011 at 01:37 PM
Not Right For WatchKnowLearn
Ages: 3 - 7
Christmas Song for Children - Up on the Housetop
From YouTube, produced by BrighterMoon Productions
One of the most famous children's Christmas songs, "Up on the Housetop". Up on the Housetop, is one of the most popular Christmas songs for children. Your children will have so much fun singing this well-loved holiday song. This adorable kids Christm... [more]
December 16, 2013 at 01:55 PM
Not Right For WatchKnowLearn
Ages: 8 - 13
Multiply Using Repeated Addition.
From eduplace.com, produced by Houghton Mifflin
Students will use manipulatives to model multiplication using repeated addition.  User clicks through the slides.
May 20, 2010 at 04:08 PM
Not Right For WatchKnowLearn
Ages: 13 - 18
Bytesize Science Presents: The Chemistry of Fireworks on Vimeo
From Vimeo, produced by ACS Office of Public Affairs
From the sizzle of the fuse to the boom and burst of colors ––a new American Chemical Society (ACS) video brings you all of the exciting sights and sounds of Fourth of July fireworks. The Chemistry of Fireworks, part of the ACS Holiday Video Series, ... [more]
July 9, 2010 at 07:27 PM