Nominal Variables
This teacher-made video briefly explains nominal variables and provides a few examples. How do these differ from ordinal variables? (0:52)
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How To Read Aloud 'Chicka Chicka Boom Boom'
by Julie Fowlkes, the lead trainer from BMABF reads aloud to students with the fun book Chicka Chicka Boom Boom. The illustrations are not easily seen and would not make for a good read-aloud in a classroom. However it is a good resource for effective strategies of implementing read-alouds in the classroom. (7:01)
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How to Do Multiplication with Fractions
The instructor uses a small whiteboard in this short two-minute tutorial to demonstrate how to multiply fractions.  The video goes step-by-step and is easy to understand. The instructor does two problems. (Teacher also shows briefly how to reduce fractions.)
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Polygons
Polygons are closed plane figures formed by three or more line segments.  If a figure is open or curved, it cannot be considered a polygon.  Concave polygons have at least one diagonal that does not pass through the interior of the polygon; all of the diagonals in a convex polygon are contained within the figure.  Equiangular polygons have all angles congruent; equilateral polygons have all sides congruent. (02:58)
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How to Determine the Mean
This is a brief how-to video on how to determine the mean (average) that will improve your math skills. The instructor starts out with an easy problem, then moves on to a more complex problem. (05:49)
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Miwa Matreyek's Glorious Visions
Using animation, projections and her own moving shadow, Miwa Matreyek performs a gorgeous, meditative piece about inner and outer discovery. Take a quiet 10 minutes and dive in. With music from Anna Oxygen, Mirah, Caroline Lufkin and Mileece. Miwa Matreyek creates performances where real shapes and virtual images trade places, amid layers of animation, video and live bodies. (11:00)
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Flowers by StudyJams
Flowering plants have many parts that are required for reproduction.  These parts, including the stamen, pistil, and ovary work together to make seeds through the process of fertilization.  This cartoon animated video from StudyJams uses simple terms and clever animation to help teach about flowers.  The video would be a nice addition to a lesson on pollination, fertilization, sexual reproduction, or the parts of a flower.  A short quiz is also included in this link.
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Introduction to Chemistry
This is one of the longer (but, excellent!)Â videos on WatchKnow, however, the viewer will see that the video is digestable in small chunks. The video has beenÂ cut into small 'segments' or 'chapters' on the side. This is one of the free videos on Educator.com; the rest require a subscription fee.
"This lecture is an Introduction to Chemistry.Â Instructor will go over Chemistry as an Experimental Science which studies changes in matter and Energy Distribution before delving into Propertie

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Carnegie Observatories' Wendy Freedman On Hubble and Size of Universe
This spring, Director of the Carnegie Observatories Wendy Freedman spoke at the American Museum of Natural History's Hayden Planetarium about astronomer Edwin Hubble's discovery of the galaxies and the expansion of the universe, how astronomers measure vast distances, and how the Hubble Space Telescope is used to measure the size and age of the universe. Mike Shara, curator in the Department of Astrophysics, sat down with Freedman for an interview in the Hayden Planetarium to discuss the expansi
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