Below is a link to a podcast by 'The math dude' entitled 'What are Numerators and Denominators?'.
http://mathdude.quickanddirtytips.com/what-are-numerators-and-denominators.aspx
I think podcasts such as this one would be a great tool for learners to use as an introduction to a new topic. For example, before begining a unit on complex numbers, I could set a homework task that involves listening to a podcast describing the relationship between real numbers, imaginary numbers and complex numbers. Students would have a bit of background on the subject before coming into class, and the podcast may already have sparked some questions for students.
They would also be a great tool for revision. I could create my own podcasts simply by recording my lessons during class. Listening to the lesson a second time at home may help to consolidate the information for learners.
One problem with using podcasts is that the information contained will not necessarily be correct. It would be my responsibility to review the podcasts before referring students to use the material.
References: http://www.aol.org.au/?feed=podcast&category_name=Meditation
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