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WP 34S Scientific Calculator

Open source calculator for RPN fans

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HUB-ee Wheels

Robotic add-on for Lego

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uFactory uArm

Robot arm kit for hobbyists

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Khan Academy

Great free online courses

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SuperMemo + Anki

Best memorization aid

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Alphablocks videos

Videos to teach kids how to read

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HP 35s Scientific Calculator

Best scientific calculator

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Superior flash card system

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Best online degree info

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David Macaulay’s Visualizations

Understanding big buildings

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