Here are a few screencasts I made a few years back using powerpoint and the (Mac) program Screenflow.  

Collection Contents

Metric System I

by Robert Becker

This is part I of a two part series on the metric system.
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Metric System II

by Robert Becker

This is part II of a two part series on the metric system.
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Measurements I

by Robert Becker

This is part I of a two part series on measurements
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Measurements II

by Robert Becker

This is part II of a two part series on measurements.
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This is part I of a three part series on calculations involving significant figures.
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This is part II of a three part series on calculations involving significant figures.
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This is part III of a three part series on calculations involving significant figures.
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Density I

by Robert Becker

This is part I of a three part series on density.
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Density II

by Robert Becker

This is part II of a three part series on density.
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Density III

by Robert Becker

This is part III of a three part series on density.
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Archimedes Principle I

by Robert Becker

This is part I of a four part series on Archimedes Principle.
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Archimedes Principle II

by Robert Becker

This is part II of a four part series on Archimedes’ Principle.
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Archimedes Principle III

by Robert Becker

This is part III of a four part series on Archimedes Principle.
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Archimedes Principle IV

by Robert Becker

This is part IV of a four part series on Archimedes Principle.
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