Roger Clay Books

Cosmic bullets
Cosmic bullets

By Roger Clay

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In Cosmic Bullets leading cosmic ray experts Roger Clay and Bruce Dawson tell the incredible story of the discovery and study of these messengers from deep space. They point out that despite a cent...

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Integrating the curriculum
Integrating the curriculum

By Roger Clay

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Cosmic bullets
Cosmic bullets

By Roger Clay

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Balas cosmicas
Balas cosmicas

By R. Clay, B. Dawson

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Cosmic Bullets
Cosmic Bullets

By Paul Davies, Roger Clay

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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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