Most nations of the world (all except Myanmar - Burma, Liberia and the United States of America) use the metric system of measurement units (officially: SI Units).
The first half of this podcast is spent discussing the article Metrication in the United States (Wikipedia), which highlights the history of metrication in the US since 1866 until today.
In the second half, Peter Price describes a useful Cubic Meter Kit, to teach students the meaning of this unit and its size.
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