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, ...
When it was made: Between 3500 and 3100 B.C. More than five millennia ago, an Egyptian weaver created a simple, tailored linen dress, likely not realizing just how long it would stick around. The ...
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