In case you’re counting, the average American will go through 26 kg (57 lbs) of toilet paper in a single year. Multiply that by the 332 million people in the U.S. and you get more than 19 billion ...
Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...
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