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How to Make a Periscope

Periscopes were invented to observe things from a hidden position. They were used to see above water from submarines, in all directions from inside a tank, and above ground from trenches by soldiers d ...

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The Lesson Plans Page: unidades didácticas y recur...

We now have over 4,000 free lesson plans! To find lesson plans that match your criteria, begin by selecting a subject, recent additions, or seasonal lessons in the box below, or search for specific to ...