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In this edition, Bill shows all kinds of unexpected places where magnets can be found. In fact, the Earth itself is a huge magnet. Find out how to make a compass and why opposites attract.
Telescopes, spectroscopes, microscopes, stethoscopes, radar, thermometers, scales, barometers not to mention the humble ruler are ...
In this episode, find out how humans move around for food, shelter, and to meet other humans. Format: DVD Release Date: / 8/ 20 ...