Todd K. Shackelford Books

Sperm Competition in Humans
Sperm Competition in Humans

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The Evolution of Sexuality
The Evolution of Sexuality

By Todd K. Shackelford, Ranald D. Hansen

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Attraction, mating, reproduction: it is a given that as a species, human beings are concerned with sex. And whether the study compares sexual behaviors of men and women or considers the proportions...

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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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