Shanna Swan is a scientist who has spent decades chasing a mystery: why global sperm counts have seemingly dropped significantly since the 1930s. At its heart, this story is simply a brilliant yarn. It has got all the elements of a Hollywood movie: this heroic dog-with-a-bone scientist, recalcitrant big business in the role of the baddie, and the looming threat of a global fertility crisis caused by harmful chemicals in everyday plastics such as baby bottles, garden hoses, and

that Tupperware you use to heat up your lunch.

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