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, ...
There are more tornadoes in the US than anywhere else on Earth. How do they form? This is in part because of the geography of the US. (AP video/Laura Bargfeld, Shelby Lum. AP animation/Eva Malek) ...
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