John Cramer Books

Twistor
Twistor

By John Cramer

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Einstein s bridge
Einstein s bridge

By John Cramer

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Einstein's Bridge
Einstein's Bridge

By John Cramer

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Einstein's bridge
Einstein's bridge

By John Cramer

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Twister
Twister

By John Cramer

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Twistor
Twistor

By John Cramer

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"Gripping novel of hard science fiction by physicist author recounts discovery of the Twistor Effect, which opens doors into countless alternate universes and draws dangerous attention from industr...

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The Siege of Haven
The Siege of Haven

By John Cramer

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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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