Jim Callan Books

The New York Public Library amazing scientists
The New York Public Library amazing scientists

By Jim Callan

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Discover the moons of Jupiter with Galileo. Uncover the science of radiation with Madame Curie. Travel forward in time with Einstein. Find out how scientists learned to cure diseases, how they disc...

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Amazing Scientists
Amazing Scientists

By Jim Callan

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America in the 1930s
America in the 1930s

By Jim Callan

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America in the 1960s
America in the 1960s

By Jim Callan

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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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