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#169 Why the US is shooting down UFOs; the science behind period cravings; saving the UK’s rivers

The world, the universe and us

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Introduction

New Scientist Weekly brings you a curated selection of the essential stories of the week. This week we're going to start with rivers, and how New Scientist is trying to do something about their plight. We'll also be hearing about the first study into the evolutionary function of head hair in humans - and ask why the US Air Force is suddenly shooting down UFOs over North America.

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