Bobby Mercer Books

The Robot book
The Robot book

By Bobby Mercer

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"The 20 easy-to-build robots in this project book can be constructed for little or not cost using common household objects and repurposed materials."--

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Junk drawer engineering
Junk drawer engineering

By Bobby Mercer

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Outlines twenty-five projects to test the reader's engineering skills that use materials commonly found in a junk drawer, including a marble roller coaster, egg catch device, and pasta bridge.

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Junk drawer physics
Junk drawer physics

By Bobby Mercer

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A children's instructional book on how to use readily available materials to turn the house into a science lab Physics teacher Bobby Mercer provides readers with more than 50 great hands-on experim...

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Junk Drawer Geometry
Junk Drawer Geometry

By Bobby Mercer

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Junk Drawer Geometry
Junk Drawer Geometry

By Bobby Mercer

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Racecar Book
Racecar Book

By Bobby Mercer

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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