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Fun With 2D and 3D Geometry Shapes
11 Lessons Free
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Invisible Ink
5 Lessons Free
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Build Your Own Internet Ad-Blocker
15 Lessons Free
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Make Your Own Battery With Lemons
4 Lessons Free
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Build Your Own Hydraulic Bridge
6 Lessons Free
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Build Your Own WiFi Weather Station
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3D Printing 101
2 Lessons Free